This is the screenshot from Terminal Server Agent (muh2)
When I try to check logs, I found the following lines.
[24 Mar 10:19:57] Added user domain/user with ID range <19969,20224>
[24 Mar 10:19:57] Client is connected to PDP: xxx.xxx.xxx.xxx
[24 Mar 10:19:57] User domain/user failed to authenticate
[24 Mar 15:07:14] Session change event occured. Event type: WTS_REMOTE_CONNECT, session id: 5
[24 Mar 15:07:17] Session change event occured. Event type: WTS_REMOTE_CONNECT, session id: 3
[24 Mar 15:31:46] Session change event occured. Event type: WTS_REMOTE_CONNECT, session id: 5
[24 Mar 15:31:54] Session change event occured. Event type: WTS_REMOTE_CONNECT, session id: 3