After the Trados GroupShare installation or upgrade, all GroupShare services are running except the TMService Agent service which is stopped. Trying to start the TMService Agent leads to the service being stopped immediately again.

In the TMServiceAgent.log the following error is recorded:

2023-09-08 10:58:32.8160|COMPUTER NAME|Error|THREAD_ID:1|TR_ID:|EX:Failed to bind to address http://localhost:5000. One or more errors occurred. (An attempt was made to access a socket in a way forbidden by its access permissions.) (An attempt was made to access a socket in a way forbidden by its access permissions.) An attempt was made to access a socket in a way forbidden by its access permissions.|Stopped program because of exception System.IO.IOException: Failed to bind to address http://localhost:5000. ---> System.AggregateException: One or more errors occurred. (An attempt was made to access a socket in a way forbidden by its access permissions.) (An attempt was made to access a socket in a way forbidden by its access permissions.) ---> System.Net.Sockets.SocketException (10013): An attempt was made to access a socket in a way forbidden by its access permissions. at System.Net.Sockets.Socket.UpdateStatusAfterSocketErrorAndThrowException(SocketError error, String callerName) at System.Net.Sockets.Socket.DoBind(EndPoint endPointSnapshot, SocketAddress socketAddress) at System.Net.Sockets.Socket.Bind(EndPoint localEP) at Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets.SocketTransportOptions.CreateDefaultBoundListenSocket(EndPoint endpoint) at Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets.SocketConnectionListener.Bind() at
[....]

Check with your local IT to ensure the port 5000 is not blocked by any other 3rd party software or tools on the local machine where Trados GroupShare is installed.

See also: Trados GroupShare 2020 SR1 CU09 - TM Service Agent unexpectedly listens on port 5000

The port 5000 is blocked on the local machine where Trados GroupShare is installed.
There can be various reasons i.e. proxy/security software installed which is not configured to allow the port 5000.