Plesk Server Administrator PSA v5.0 System Administrator Quick Start Guide

Transcription

1 Plesk Server Administrator PSA v5.0 System Administrator Quick Start Guide

2 Table of Contents Introduction... 3 Logging on to the PSA Control Panel... 4 PSA v.5.0 Server Management... 5 System features... 5 Services... 6 Control Panel... 7 Administrator Information... 9 Step by Step Server Setup for First Time Admin Users... 9 PSA v5.0 Master Administration SSL Certificate Management Refreshing Slave System Statistics Removing Slave Server Account Editing a Slave Server Profile Reconfigurator Manual Information Top FAQ s

3 Introduction Congratulations on selecting Plesk Server Administrator. Now your administrators and clients can master the technical side of server management in a few point and clicks with this award winning software. Discover how simple managing clients, domains, and the server can be with PSA v5.0. For your convenience Plesk Server Administrator (PSA) has installed and configured the necessary applications for Web Hosting. Apache, named, MySQL, Qmail, ProFTP, stunnel, FrontPage Server Extensions, and the Server Administrator software (your web based GUI interface) should be ready to use. Using PSA anyone can manage a web server and its information. Just network the server and start managing the system through your web browser. Once you create client accounts, your clients can login and administer their own domains. PSA v5.0 lets you: Carry out routine and complicated tasks, ones that previously required lengthy Linux programming by an IT professional Share support and management responsibilities with non-technical clients to increase response rates and customer service levels Remotely access and administer servers and domains 24x7 Empower your clients to control their own accounts settings and make their own adjustments, without requiring assistance or needing to wait for a support representative Manage your domain Resellers by giving them the power to create their own domains with your parameters. So let s take the first steps to setting up the system. 3

4 Logging on to the PSA Control Panel For your security, Plesk Server Administrator (PSA) uses SSL; this requires clients and administrators to access the control panel using HTTPS: secure protocol. To access the interface for PSA v5.0, follow these steps: 1. Open your web-browser. a. Administrators and client each can access the control panel from different URLs. Administrators - IP: 8443 (Primary IP refers to the primary IP address of your server) however any IP address on your server will work). b. Clients (ClientDomain.com refers to any active domain that resolves to the server) 2. The Control Panel login screen with the username and password fields should appear. 3. As a system administrator, you can log in for the first time with the default login name admin and password of setup (both are case sensitive - lower case). NOTE For your convenience, PSA comes with a self-signed SSL certificate. This cert is generated by PSA for you and is not recognized by your browser as an authoritative SSL certificate (issued by and authority). You can still access your control panel and it will be secured by SSL, but you will receive a warning message. If you purchase an SSL certificate from an authority, you and your clients will not receive this warning. See page 16 for complete SSL certificate installation instructions. So let s get started! 4

5 PSA v.5.0 Server Management From anywhere in the system, click on the button to access the Server Administration page. From this page you can access server wide functions and manage their settings. So let s look at the Administrators system features in the Admin Screen. System features Reboot Click on the REBOOT button to restart the server. Rebooting the server via the PSA v5.0 interface also reboots the operating system and all other applications running on the server. PSA v5.0 warns you that the system will be restarted and asks you to confirm your choice. We recommend informing all users before temporarily shutting down and rebooting the server, if possible. Shutdown Click on the SHUT DOWN button to completely shut down the server, including the operating system and all else running on the server. If the server is shut down using this option, it cannot be remotely restarted. It must be manually restarted. Therefore when you need to shutdown your system we recommend shutting down the server using the PSA v5.0 interface. This ensures all open files close and all current services gracefully end. For safety, PSA v5.0 asks you to confirm the shutdown before proceeding. IP Aliasing Click the IP ALIASING button to access the IP Aliasing page. Here you can control IP Aliasing on system network interfaces. This function is specifically for servers that have more than one IP address or are on more than one interface. From this page, the user can: choose the network interface for which he/she wishes to add or remove IP aliases, add an IP alias by entering the appropriate IP address and subnet mask, and remove one or more IP aliases from the server. Note: You cannot add random IP addresses; they must be assigned by your provider. System Time Use the initial fields on this page to synchronize the PSA v5.0 server with that of a specified IP host or to manually adjust the information. For a list of NTP servers to synch your PSA system with go to or go to and enter NTP Time Servers as your search string. Click the SYSTEM TIME button to submit your settings and update the system time. 5

6 Statistics Click on the STATISTICS button to display server usage statistics. You can view or print this information at anytime. The report is especially helpful if the server is slow or is experiencing performance problems; the report may help you diagnose and correct such problems. The report lists statistics including: system up time (how long the server has been available without interruptions, such as those from rebooting or shutting down the operating system); load averages for the last 1, 5, and 15 minutes (the average number of processes waiting in the scheduler queue for execution in the last time frame); hard disk usage (capacity, bytes used and available on the server); and number of active, passive (not working or turned off), or problem (exceeding disk and traffic limits) domains on the server. Support Select the SUPPORT button to access the Plesk, Inc. Online Support Form. By Default PSA v5.0 will automatically fill in your server information and Admin information in the corresponding fields on the form. Use the remaining fields to describe your problem and send log in information to the Plesk Support team. The form will encrypt your message and send it to the Plesk Support team where a specific support ticket number is then created for you. You should receive a confirmation that includes your support ticket number. Use this ticket number to speed the response time when corresponding to Plesk support about the specific issue. Services Mail Click on the MAIL button to set up server-wide mail system parameters on the Mail System Management page. The following settings can be adjusted: max letter size (maximum allowable size of any sent or received on the server - default size is "unlimited"); mail system relaying which affects the sending of mail (choose one of three modes: open relay, closed relay and relay with authorization; white list (IPaddresses with masks from which mail is always accepted); blockers (identify hosts from which you do not allow mail to be received) and MAPS Anti-Spam protection. DNS Use the DNS button to set up your default zone files for newly created domains on your server. The template will allow you to pre-configure your default zone file setup for NS, A, MX, CNAME, and PTR records. Note: PSA by default creates a default zone file template for you. When you create a new domain on your server PSA automatically creates a zone file for the domain based on the template. You will want to add your own name servers and records to the template so that these are created automatically. Since PSA is designed to run as a single server solution it installs your DNS server (BIND) and automatically assumes that you want to use this program on the server. The DNS template will allow you to pre-determine the zone file records when you create a new domain. It can be deactivated for use with external name servers by selecting the ON/OFF button in the DNS template or by doing the same action in 6

7 the domains DNS zone file. You will want to set up your DNS template before you start to create clients and domains on the server. This will save you time and work in configuring the DNS records for your domains. Restart Services The RESTART SERVICES button allows you to select individual services to restart so that you are not forced to reboot your entire system. Restart Qmail, Apache, Named, Courier-IMAP, and Stunnel from this screen. Select the icon to restart a service. Select the icon to shutdown a service. Select the icon to bring a down service back online. Indicates the service is down and needs restarting. Indicates the service is operating fine on the system. Control Panel Logo Setup Click on the LOGO SETUP button to replace the PSA logo in the top banner area with your own logo. This gives a customized look to your interface, and enables you to hyperlink the logo to your organization's website. By Default your Clients will see your Logo on the top of their interface and the main Login Page for PSA. Note: All users login to the PSA interface on the same screen. If you have resellers on your system you will want to make this entry portal a generic nonbranded screen. This will give your resellers customers the effect of being on the resellers server not your own as administrator. Sessions Click on the SESSIONS button to access the Sessions Management page. Here you can set up different PSA v5.0 security parameters including allowable session idle time, invalid login interval (interval between two invalid login attempts within which the invalid login attempts counter is increased), invalid login attempts (maximum quantity of invalid login attempts allowed), and invalid login lock time (lockout time for a user once the invalid login attempts counter has exceeded its maximum limit). Certificate Click on the CERTIFICATE button to access the certificate management page. From this page, you can upload a certificate file from your computer or local network, generate a self-signed certificate, generate a certificate-signing request, and upload a specific certificate text. 7

8 NOTE It is recommended that you replace this default certificate with a domain-specific one such as a self-signed certificate or one signed by a recognized certificate-signing authority. Preferences Select the PREFERENCES button to change the display and configuration of the interface. On this screen you can create a paging feature for displaying lists of clients or domains on the system, select a default language for initial viewing, and select skins for changing the look and feel of the interface. This screen also allows you to increase your password security, decide how long you want the system to store traffic statistics and what features are to be used in calculating disk space usage. Add Services Select the Add Services button to activate Domain Registration or Certificate Purchasing for users of the system. Register your server with MyPlesk.com and instantly select the services that you would like to make available on your E- commerce portal. When users on your system go to your portal and select a service or product to use on the system you get paid. You don t have to process any paper work or track your sales because Plesk will do it for you. Simply login to your portal using your unique server password and track sales and see what additional money you will earn each month from the system. Increase your Return on Investment by enrolling today. Notifications Select the Notifications button to configure the automated notifications feature in PSA v5.0. You can automatically send your clients and domain owners a customized personal and have the system include their login names and passwords when a new client or a new domain is created. Set account limit notifications to warn your customers or yourself of increased usage for both disk space and traffic. Include daily calculated statistical system information in the notification. This can make the automated sign up process even easier and give your customers the early information they need for managing their account. Domain Templates This Tool allows an administrator to pre-configure hosting plans for instant creation. Now you can create and unlimited number of hosting configurations and packages for quick selection by Resellers. You can even allow your resellers to create their own templates to be used when reselling domains on the system. Use this feature to cut your domain hosting configuration time to a fraction of what it used to take. 8

9 Administrator Information Edit user information Click on the EDIT button to change the primary user information for the Server. Check this information to be sure it's accurate. Most of the information is used by default when generating CSR request for SSL certificates and self signed certificates. It is also used by default in several other areas of PSA. Note Be sure to change the default password the first time you administer your server. It is also a good idea to adjust your session settings. This will prevent an initial lock out period of 30 minutes when a browser is accidentally closed. Change Password Use this screen to change your Admin Password to the PSA interface. Step by Step Server Setup for First Time Admin Users 1. Log in to your PSA v5.0 interface as Admin. 2. Agree to the end users license agreement and check the don t show me again box at the bottom of the agreement. If your provisioning the server for another Admin leave the box un-checked so that they can agree to the terms. 3. Next Select the IP you wish to use in the drop box provided for you. This can be changed later if you wish. You will also be prompted to setup your Full hostname. Fill in the full host name of the system. This should be a 3-part name such as server1.domain.com. Warning: Do not use www as the prefix to your full host name. 4. Once step 3 is complete you will be prompted to fill in your Administrator information. A red * indicates required fields that you will need to complete. Click the button at the bottom of the screen once the information is completed. Note: If your PSA license is Multi-Language capable and you installed a language pack you can change the default interface language for the Admin at the bottom of this screen prior to continuing to step Select the button to go to the systems Admin screen. 9

10 6. Select the button in the Admin Information section at the bottom of the page. PSA by default uses setup as an admin password and you will want create your own unique Admin password for your system. 7. Select the button in the same Admin Information section at the bottom of the page. You should see the information that you entered in step 4. This is where you can update the server owner information for the system. If all your information is correct select the admin screen. Use the button to save any changes. to go back to 8. Next go to the Control Panel section and select the button. We suggest that you change your invalid login lock time from 30 minutes to a shorter period around 5 minutes. This will prevent you from having to wait long to re-access your interface if you accidentally close your browser without logging out of the system. Click adjustment. after you make this 9. Next select the button and set the correct server time. This can be synchronized with NTP servers worldwide if you like. Synchronization to external NTP systems occurs every 47 minutes automatically. For a list of servers and their time zones go to After inputting your system time click the button to update the system. Up level out of the System Time screen. 10. Select the button. a. Use the display lines per page feature to speed the page loading process on highly populated systems. By default this is left blank which means paging is turned off and all clients and domains will be loaded whenever you go to a screen displaying created account names. This display all setting is fine for less populated systems but as your accounts increase you can speed the page loading process by activating the paging feature to show 25 or 50 accounts at a time. This feature allows you to page through lists of customers sort them or search the entire system making it much faster to navigate and find the domain or client you re looking for. b. Select the default language that you would like your users to view the interface in. Localized Multi-Language is optional. PSA is by default in English but if you do activate the Multi-language feature and install a language pack it will show up in the drop down menu for selection. This allows different system users to view the interface in multiple languages at the same time. 10

11 c. Next select a skin to view your PSA v5.0 interface. Open the drop down box and select a skin. Once a skin is selected the software automatically refreshes itself and your new skin will appear. Your system comes with 2 default skins and your able to create your own skins and plug them into PSA to match your brands look and feel. Information on creating a skin can be found in your PSA v5.0 users manual at You can download additional default skins for PSA v5.0 from My.Plesk.com. d. Next on this screen is a complex password verification option. By checking this box PSA will check Mail Users passwords against a dictionary of known simple passwords and disallow their use. This ensures that a mail user on the system does not jeopardize the mail server by using an easily duplicated password. This also will force system mail users to create more complex passwords to their accounts when activated. Note: This option could make it more difficult for a mail user to setup their account. If the dictionary duplicates the password it will force them to create a more complex mail user password. e. Next on the screen is the time setting box for retaining traffic statistics. By default PSA v5.0 will retain 3 months of statistical information for billing purposes. If you would like to retain these stats longer type the number of months that you would like to store this information on the system. f. Finally under the Preferences section is the option to decide which system information you would like to use for calculating disk space used by any account on the system. By selecting the log files, databases, or mailboxes checkboxes you are including this item in the calculation of an accounts disk space usage. Be sure to select the screen. to save your changes in the Preferences 11. Select the button. On this page you decide who gets notified of an event that occurs on the system. These notifications are made automatically via to your selections. Notice that you can notify yourself and the client of specific events such as new domain creation and new client creation. This is used to automate the process of notifying new customers of their accounts and their login information. You can also notify a client if they exceed any of their pre-defined limits for Bandwidth usage and Disk Space usage. Select the button and notice that the system will use brackets to define default information for individual accounts <default>. Use this editor to personalize your various notices on the system. These tags will let the system know to use the specific information for the account that is being notified. Use these tags to automate your notifications and shape them in your own professional manner. 11

12 Notification Tags New client creation <client> - client's control panel login name <password> - client's control panel password <ip> - IP-address for control panel access New domain creation <domain> - client's domain name <client> - client's control panel login name <ip> - IP -address pointing to the domain name Account limit notices <client_login> - client's control panel login name <client_contact_name> - client contact name <disk_usage> - disk space currently used <disk_space_limit> - disk space limit set for the account <traffic> - amount of traffic currently used <traffic_limit> - traffic limit set for the account Note 1: The address is not a required field in the information screen during Client Creation. Therefore you must be sure to include this in the account setup if you prefer to automatically notify the client or domain owner of system events. Note 2: When you set an automated notification, the message is sent by the system using the Administrators address as the sender. Selecting the button in the Admin Information screen as described in step 7 to make changes to this address. 12. Select the button. This is where you register your system with My.Plesk.com (MPC). This is the Plesk, Inc. commerce center that you can customize for your clients. Your Registration is free with your PSA v5.0 license. Select the register button and follow the directions on MPC. The system creates an Admin account in the commerce portal for your server. Customize the account to offer any of the services or applications you like. When your Clients login to the system they become part of your servers account. As your clients become familiar with the portal they can use it to register domains, purchase SSL certificates, and purchase a pre-selected list of applications available for the PSA system and their domains. Every time they use the portal for their accounts you enjoy the revenue with out the hassle of accounting responsibilities. My.Plesk.com gives you a management portal to view your sales and the system accounts and instantly get an update on what your clients are purchasing as well as the amount of revenue you will receive at the end of each month. No headaches, no minimum purchases, no partnership fees just additional revenue for you to enjoy from your customizable portal. 12

13 13. Next let s prepare the system for creating Client Resellers, Clients, and Domains. First select the button. What you see is a DNS template for automatic creation of DNS zone files in newly created domains on the system. PSA by default assumes that it is going to act as the DNS server for all of the domains created on the system. Therefore it creates the zone files by default as Master records. These records are used to direct requests to the correct virtual hosts and identify your server as the primary nameserver for all of the domains on your system. To switch the files to secondary or Slave files to an external DNS server, select the button in the domain DNS section and enter the IP of the master file you wish be slave to. For our purposes we will assume that you want your server to be the primary DNS system for the domains administered by PSA. This Template is a representation of the zone files that we will be creating for each new domain. To set this file properly you will need to add your registered nameserver records to your template. If you have not registered nameservers with a registrar contact your provider for help with setup. If you have registered nameservers then let s add these to the DNS template so that they are automatically setup for new domains. First remove the default NS record in the template. It should be the first zone record in the file and it will look like this. <domain>. NS ns. <domain>. Select the button to the right of this record. Once you delete this record you will need to create a replacement. In the drop down box select NS and click the button on the right side of the interface to create the zone record. Leave the top domain name field empty and fill in your nameserver information where it indicates enter nameserver. Select the button and your new record should appear at the top of the file. The new record should look like this. <domain>. NS ns1. nameserver. com. Now that your primary nameserver is entered follow the same steps to create a record for your secondary nameserver. When this is complete select the button to go back to the screen. Note: To complete the setup of your DNS system you will need to create A records for your Nameservers in a domain on the system. You can create these records in any domain in PSA. 14. Select the button. This screen is where you configure your mail server preferences. a. First select a maximum letter size for your mail server. If left blank there will be no limit to the size of an your system will accept. b. Next you will want to configure your mail relays, which are closed by default. An Open relay indicates that anyone can use the system to send mail. A closed relay indicates that your mail server is running but 13

14 will not accept or send mail. Select the Authorization is required: checkbox to force clients to be authorized by the system. This is the safest and most commonly used mail configuration. c. Then set your lock time for password security. Notice that you can white list an IP for accepting all mail. You can setup blockers on the system for domains you prefer not to receive mail from and you can activate MAPS Spam protection to filter out known SPAM accounts and stop the before it reaches the POP box. PSA v5.0 Master Administration Multi-Server Management (Optional) Select the button in your PSA v5.0 Master enabled software. This screen allows you to setup specific PSA servers to act as slave systems to this PSA Master System. Use this interface to manage up to 50-networked PSA servers. In this interface you will be able to add and to log on to other PSA systems, manage them remotely and monitor the detailed PSA system status information from a single point of entry. Using the Master feature in your PSA software you can perform a variety of multiserver tasks in a few clicks. From the Master interface, you can perform the following functions: Add slave systems to the Master interface Edit slave system profiles View slave system statistics without a login requirement Instantly log in to a slave server Contact slave system administrators View slave system application status Manage slave system SSL certificates Now that you have selected the Master administration page lets add a slave system. Select the button to access the slave server profile screen. Enter the Hostname of the system you would like to administer to from your Master system. The Hostname can be either an IP on the slave system or a domain name on the system. Note: You do not have to include the [ prefix to the Hostname. The Master software will do this for you automatically when you login to the slave. Notice also that the admin login is entered by default. This is required if you are going to manage slave systems as the administrator. Next type the admin password to the slave system in the required (*) password textbox and then add a Description for the slave system. The description (the display box is 32 characters in length and longer descriptions will be abbreviated automatically by the interface) and can include letters, numbers and characters for distinction. This will be the server name to help you differentiate between similar 14

15 slave systems. Next if the slave system is running a PSA v2.5 or earlier release you will want to check the do not request information from the server checkbox to keep the Master interface from attempting to retrieve statistical information. Attempting this can slow the operation of the Master interface. Leave the box unchecked if you are using PSA v.5.0 on the slave. (PSA Master will only pull statistics from PSA v5.0 and above software.) To complete the installation select the button. You should instantly have the systems statistical information in the sub screen below. Scroll down to view the new slave statistics screen. Use the the button to update your slave systems statistics. Use button to access the slave system as administrator or select the button to go back to the Master interface. Now you will see the slave system and its description in the Master Administration screen. Notice that the Hostname is Hyper linked to the statistics page for your slave system. Use the icon to login to the system directly from the Master administration screen. A colored icon will indicate the status of a slave server: Indicates that the slave server s systems are operational Is displayed when a system service is experiencing problems Is displayed if there are problem clients or domains on the slave server Is displayed if the server is down or disabled Is displayed if the server information is not requested from Master PSA allows you to search through the list of slave servers for a certain pattern. This helps you when there are large numbers of slave server accounts registered in the system and you need find a specific one. Use the button to assist you in quickly finding the slave system you would like to administer to. To search in the Servers List: Select the input field and type in the pattern string. Click the button to display any systems found matching the pattern string entered. Matching strings will be displayed in the form of the short servers list. If no matches are found PSA will indicate that no matches were found. Select the button to revert back to displaying the entire list of slave server accounts. You may also sort the list by Status, Hostname and Description. To sort the list by a certain parameter in ascending or descending order, click on the name of the parameter. An arrow will appear indicating the order of sorting: down for descending order and up for ascending. Using Master you can send an message to the administrator of a slave server. To send your admin an , check the SEL checkbox next to the Hostname of the 15

16 server and click the button. Your creation client should appear with the addresses of the administrators for the system(s) you selected. To Log on to a Slave Server: In the main Master Administration page click on the icon that relates to the appropriate slave system. The PSA interface for the new system the will open in a new browser window and automatically log in. When you re in the secondary slave server profile screen select the button to enter the system you re viewing. Again Master will open a new browser and automatically log in. SSL Certificate Management To manage certificates for a slave server select the button. You will be taken to Slave server certificate management page. You can copy and paste the certificate content right into appropriate field or simply browse to its location by clicking on the Browse... button. After that, click on buttons respectively to submit the certificate. To discard changes made to the certificate select the return to the Slave server profile page. or button prior to updating and Refreshing Slave System Statistics Next let s verify slave system information as up to date. Refresh the information on the slave server, by selecting the button. The screen should reload in a few seconds (depending on connection speed) with your updated system information. Scroll down to view systems statistics or check the status of your slave system Qmail, Apache, Named, Courier-IMAP, and Stunnel services. Use this screen to monitor critical services on all of your slave systems. Removing Slave Server Account To remove a slave server account from the Master list, select the slave server that you wish to remove using the SEL checkbox on the right side of the Slave Server screen and click the button. You will be asked to confirm your wish to delete this account from the Master interface. Confirm the removal, and click to remove, or to retain the slave server account. Editing a Slave Server Profile Occasionally, you may need to change the information in a slave server profile. To edit the profile access the Slave Server Administration page by clicking the button at the top of the PSA interface and select the host name of the slave server whose profile you wish to edit. 16

17 The Slave server profile page appears, displaying detailed slave server account information. Select the corresponding text box to edit the information. When you are done, click the The changes will take effect immediately. button to save the changes made. Reconfigurator Manual Information During the process of installing PSA the Administrator selects the IP-address to be used for name-based virtual hosts. This address is maintained strictly fixed and the Administrator is unable to change it by means of the Control Panel. The Reconfigurator utility serves the purpose of changing these parameters after an installation has already been completed. Also Reconfigurator allows the user to change the Administrator's e- mail address as well as the host name and domain. Reconfigurator is implemented in the form of a shell script. It is located in the directory /usr/local/psa/bin. The name of the Reconfigurator utility file is reconfigurator.sh. The Steps performed by Reconfigurator: System check Configuration parameters request Set up of particular services (MySQL, admin, web mail, Apache, Qmail, Named) Has the Reconfigurator been started with root permissions? Does the system have all the programs necessary for the installation? Are shadow passwords used (for Linux)? Then Reconfigurator requests the Administrator to enter certain parameters needed to further configure the system: Host name and domain Admin IP address for name-based hosting Note: If when running the script you specify an IP address that is already in use for IP-based hosting by a domain on the system the Reconfigurator will issue a warning and exit without making any changes. To use this IP address, you must first remove it from the domain that is using it (specified by Reconfigurator) for IP-based hosting via the Control Panel. Services Performed by Reconfigurator: Host name and domain are added to the database and entered into the configuration files for each service replacing the previous settings. If changed the Admin is added to the database and entered into the apache server's configuration files replacing the Server Admin directives values. 17

18 If changed the new IP address used for Name based hosting is added to the database and used for Name-based virtual hosts. The DNS (named) service is automatically reconfigured accordingly. Top FAQ s Can PSA set up multiple domains pointing to the same domain? How do you change the port for the PSA interface? I'm trying to create a self-signed certificate/csr for a domain. I've enabled ssl in the physical hosting screen but the 'ssl' button is still grayed-out. How can I enable this button? A client did not properly log out for some reason, and now he cannot log back in. The PSA control panel interface keeps telling them that another session is still running. How can they log in again? A client has managed to lock the interface by using the incorrect password more than 4 times. How do I unlock this? How do I create a sub domain through the PSA interface? How do I transfer the ownership of domains between clients? How is the domain's 'real traffic' measured? What files are required to be backed up in order to restore all of the content within PSA? When I try to send reports for clients the s are not sent. Is it possible to add more than 255 IP addresses through the PSA interface? How is the domain's disk quota measured? Is it possible to have two admin users logged into PSA at the same time? Is it possible to use.name domains in PSA? 18