Problem using Remote Desktop Connection through VPN(PPTP) connection

Posted on 2009-05-21
Medium Priority
Last Modified: 2012-05-07
Hi All,

I have a little problem whereby upon connecting to work using my PPTP connection, I cant connect to my machine using the Remote Desktop Connection, however, if I then disconnect from the vpn and then connect again, it works.

This seems to happen for most our clients, and it doesnt always fail on the first attempt.

We use a Watchguard Firebox and all client PCs are Win XP Pro

Very annoying.

Has anyone had a similar issue??
Question by:daviesgroup
  • 2

Expert Comment

ID: 24451448
Try to fix a lower MTU

Author Comment

ID: 24451484

Could you explain how this would help please?


Accepted Solution

htam earned 2000 total points
ID: 24451538
A series of ping tests using the command, ping "remotge ip" -f -l xxxx, where xxxx is the packet size, can be used to determine the optimal MTU for your connection. Start from xxxx = 1400 and after lower

Begin increasing the packet size from this number in small increments until you find the largest size that does not fragment. Add 28 to that number (IP/ICMP headers) to get the optimal MTU setting. For example, if the largest packet size from ping tests is 1462, add 28 to 1462 to get a total of 1490 which is the optimal MTU setting.

The Windows built-in PPPoE client has a default MTU of 1480. To change the MTU, please refer to the Microsoft Knowledgebase: http://support.microsoft.com/default.aspx?scid=kb;en-us;283165 and http://www.microsoft.com/windowsxp/pro/using/howto/networking/pppoe.asp 

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