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Why are Remote Desktop connections slow when connecting from Windows Vista or Windows 7 through my Barracuda SSL VPN?

  • Type: Knowledgebase
  • Date changed: 5 months ago
Solution #00003833

Scope:
This solution applies to Barracuda SSL VPNs, all firmware versions.

Answer:
If you are experiencing a very slow connection to an RDP shortcut when using Windows Vista or Windows 7 (it takes many seconds for the start menu to appear), when your XP machines can connect with no problems. To correct this issue, follow the below instructions:

Windows Vista and Windows 7 use a feature called auto-tuning for the TCP/IP receive window. This has been known to cause this slowdown.

To fix this:
  • Go the vista run command, type in cmd.
  • In the cmd entry that appears in the list above, right click this and select Run as Administrator.
  • You are now in a command window with elevated rights. Type in the following command:
           netsh interface tcp set global autotuninglevel=disabled
  • Then exit the cmd window. You should now get the full speed on an RDP connection.
Additional Information:
For background information relating to this issue, please see this article that discusses the issue.

Link to This Page:
https://campus.barracuda.com/solution/50160000000HVCmAAO