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Cant access TS with error code 0x1104

Because of protocol error detected at the client (code 0x1104)

Situation: The client has been RDC to access their Terminal Server for years. Since last week, he can't access the TS any more.

 

Troubleshooting: 1. Telnet port 3389 from the Internet, receive this result: ╙├╗╩▓╗╣╗╟δ╙δ╥╓╛╚φ╝■┴╧╡╣║┬≥ http://www.youngzsoft.com/cn/

2. Telnet port 3389 inside, it is normal.
3. If using RDC to access TS, you will receive this message: "Because of protocol error detected at the client (code 0x1104), this session will be disconnected".

4. If we run netstat no, the port 3389 is connecting to 117.26.176.32 and PID 3396. The PID 3396 is spoolsv.exe.

 

Case 1: Someone changed the port 3389 to 2288. Fixing it by change the router forward port from 3389 to 2288.

 

Case 2: New installed software changed the port from 3389 to 3399.

 

Case 3: The RDP-Tcp folder was deleted from regedit: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Terminal Server\WinStations\

 

Case 4: It could be virus or spyware. More information can be found this post:

What's the spoolsv.exe

 

 

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