This solution applies to Barracuda SSL VPNs, all firmware versions.
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:
- Then exit the cmd window. You should now get the full speed on an RDP connection.
For background information relating to this issue, please see this article that discusses the issue.
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