Slow RDP Connection in the afternoon

Posted on 2011-10-10
Last Modified: 2012-05-12

I have a Windows 2008 terminal server. Clients login on the terminal server using a specific WAN connection that I only used for RDP connections.
We have a second WAN connection for all other traffic.
In the afternoon our RDP connection becomes very slow regardless if there are many users logged on or not. When we connect with the other WAN connection everything works fine.
Speedtests are normal and my ISP said everything is OK.
The next morning everything works fine until 3 in the afternoon.
What can be the problem here?

Kind regards,
Question by:PHagers
    LVL 25

    Expert Comment

    If it's running to clockwork like that, it suggests some kind of automated task.

    Can you monitor bandwidth usage over the WAN link? Or can your ISP? And give you some idea of what's travelling over the link at that point in time?

    Accepted Solution

    Hi Tony1044,

    There was almost no bandwith usage (75Kbps) but we found the problem. Probably a DoS attack on port 3389. We changed the port and problem is solved.

    Thanks for your help!

    Author Closing Comment

    Is there a way to not give yourself a grade?

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