Hello @Bob Ford ,
Thanks for your query.
1.If you want to allow more than 2 simultaneously sessions, RDS deployment with appropriate RDS CALs installed is necessary.
(1) RD Connection Broker
(2) RD Session Host
(3) RD Licensing server – there is 120-day licensing grace period, appropriate RDS CALs should be purchased and installed before it has expired.
How to Install and Activate the RDS Licensing Role on Windows Server 2019/2016?: http://woshub.com/install-activate-rds-licensing-role-windows-server/
Deploying Remote Desktop Services 2016 Step-By-Step: https://nedimmehic.org/2017/01/21/deploying-remote-desktop-services-2016-step-by-step/
License your RDS deployment with client access licenses (CALs): https://learn.microsoft.com/en-us/windows-server/remote/remote-desktop-services/rds-client-access-license
RDS cals can be purchased from Microsoft volume licensing service center:
https://www.microsoft.com/licensing/servicecenter/default.aspx
2.You could either do it with Group Policy:
Computer Configuration\Administrative Templates\Windows Components\Remote Desktop Services\ Remote Desktop Session Host\Connections\
Restrict Remote Desktop Services users to a single Remote Desktop Services session value: Disabled
Next, double-click on Limit number of connections and then set the RD Maximum Connections allowed to 999999.
Or you could edit the registry as follows:
HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server
fSingleSessionPerUser value: 0
fdenyTSConnections value: 0
Easiest way to enable more than 2 concurrent RDP sessions on Windows Server 2016: https://social.technet.microsoft.com/Forums/en-US/c52b6da7-cdf2-4e1f-95d1-6471c6f2f6b0/easiest-way-to-enable-more-than-2-concurrent-rdp-sessions-on-windows-server-2016?forum=winserverTS
How do I allow more than 2 RDP sessions to a Windows Server 2012: https://social.technet.microsoft.com/Forums/lync/en-US/deae11b0-8572-4d92-8d77-23f9e169941d/how-do-i-allow-more-than-2-rdp-sessions-to-a-windows-server-2012?forum=winserverTS
Best regards,
Leila
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