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Vista RDP vs Legacy RDP MTU Sizes

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This tip comes from Matt, who has done an amazing amount of detective work to find out the cause of the error below:

Vista uses a larger MTU size than the older client.

The new RDP client is set for do not fragment packets.

If anyone is doing an RDP over IPSEC they will need to set an MTU of 1370 and enable fragmentation with DF bit removal.

The error message that indicates this problem is Remote Desktop disconnected due to a protocol error 0x104d.

Comments

  • Anonymous
    May 20, 2007
    Could you be a little more specific on how to chagne the MTU size? Is this done on the Windows 2003 (in this case) Terminal server, or at the Vista client?