We've been having some problems in our school with Thin-client machines kicking students off their session for some weeks now, and it appears to have something to do with an error in the event logs - TermDD Error 50.
The error is:
Event Type: Error
Event Source: TermDD
Event Category: None
Event ID: 50
The RDP protocol component X.224 detected an error in the protocol stream and has disconnected the client.
For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp
0000: 00 00 0a 00 02 00 58 00 ......X.
0008: 00 00 00 00 32 00 0a c0 ....2..À
0010: 00 00 00 00 32 00 0a c0 ....2..À
0018: 00 00 00 00 00 00 00 00 ........
0020: 00 00 00 00 00 00 00 00 ........
0028: 0b 00 00 00 71 75 69 74 ....quit
0030: 0d 0a ..
I thought it was a networking issue to start with, so we replaced many of our switches. All the clients are connected by 100mb LAN.
We have uninstalled TS licencing from the AD controller (datastore) from which it was installed, removed the x509 certificates (as per KB http://support.microsoft.com/kb/329896
) rebooted it and then re-installed Terminal Server Licencing back onto datastore using the telephone method.
This has not solved the problem and I am recieving 'termDD' errors on all 3 application servers.
We have x3 Appservers all running Win2003R2 using Citrix Presentation Servers and several rooms of Thin-Client boxes. There is no rhyme or reason as to which student is kicked off their session. I.e: It's not all the machines in the room, nor it is all users on a specific application server, nor is it specific users.
Has anyone had this problem before? or any idea how I could solve this????
Any help would be great as this is obviously really annoying for the teachers and not very good for the students education!