Another day, another strange problem. Thankfully, it did not take me a long time to figure it out. We have a Dell Precision T3400 workstation. Whenever we tried to connect to it using Remote Desktop, it freezes and the only way to get it back is to reset it.

I checked the logs and the only thing related to the problem is a log entry about TermService.

Event Type:    Error
Event Source:    TermService
Event Category:    None
Event ID:    1006
Date:        7/22/2009
Time:        10:54:23 AM
User:        N/A
Computer:    TEST
Description:
The terminal server received large number of incomplete connections.  The system may be under attack.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 98 03 21 63               ˜.!c

Before doing more diagnostics, I decided to do the regular maintenance first. I ran Windows Update and found that there is a newer version of the graphic card driver. BTW, this computer has a NVIDIA Quadro FX 570. After the graphic card driver was updated, I was able to use remote desktop client to connect to it again.

This case reminded me about a similar case. A computer I were working on got a BSOD after I disconnected the remote desktop session. The BSOD also indicated the offending component is part of the ATI graphic driver. So, if you have a problem with remote desktop connection, you might want to update the graphic card driver first.