Can't RDP through VPN

Unanswered Question
Mar 2nd, 2010
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Dear Experts,

I've the following problem:

PC with VPN Client > Internet > ISR router > LAN

Successfully connected to VPN, ping works but RDP not.

I've googled and red a lot of forums about likely the same problem but what I've found doesn't worked.

I've tried to change the MTU and tcp mss to different sizes on both the WAN and LAN interfaces, but neither worked.

Any thoughts?


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johnd2310 Tue, 03/02/2010 - 09:01
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That usually indicates an mtu issue. Have you tried changing mtu on the client as well. If you are using nat also check your nat config and access-lists are okay.



integris-kiuf Tue, 03/02/2010 - 23:02
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The MTU on the client is 1300 by default, because Cisco VPN Client is installed.

I've tried to lower it to 1260, 1200, etc, but nothing changed.

The max MTU which goes through is 1260 (tried with ping, df-bit set).

The NAT and access-list are ok, I've triple checked it:)

I know that this is an MTU issue, but I doesn't know what and where to change.

Oh, I forgot it: the server os is Windows 2000 (I know, but this is our custumers, cannot change it).

nomair_83 Tue, 03/02/2010 - 11:58
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Try to telnet that server on RDP port from client and enable logging on VPN gateway then paste any specific logs here.

make sure that users are allowed in server for RDP.

integris-kiuf Tue, 03/02/2010 - 23:05
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Can you tell me which type of logs do you want to see?

I can telnet to the server, but after I press Enter it disconnects. Is this normal?

The users are allowed to RDP to the server, from the local LAN it works.


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