Remote Desktop Connection (RDC) does not connect to remote computer

Using a SONY UX180 MicroPC with the operating system Windows XP we attempt to connect to a remote computer that is also running Windows XP Professional.  The MicroPC is located in a remote office that is connected to the main office via a VPN tunnel.  This connection is created using a Watchguard firewall.  When the MicroPC launches RDC and goes to the IP address of the remote computer the RDC connection opens showing the blue background screen but does not show the Control-Alt-Del screen to allow the user to log in.

There are two types of connection available in the remote offce; wired and wireless.  When connected to eiter of these connection types the SONY does not conenct to the remote computer.  There is a wired desktop computer connected in the remote office.  The desktop computer works without a problem.

I was thinking that this issue resolved around screen resolution but using trial and error I have not been able to find a setting that works.  The other variable is that the SONY only behaves this way when it is located in the remote office.  If the SONY is connected wirelessly or wired to the main office network it opens the remote desktop connection without a problem.

We have done the standard network tests of PING and Traceroute and both are successfull when attempting to connect from the SONY in the remote office to the computer in the main office. the firewall at the remote location and the main office does not show any packets being blocked or any unusual error messages.

Any thoughts would be helpful!

Thanks.

ctunksAsked:
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Pete LongConnect With a Mentor Technical ConsultantCommented:
On the REMOTE PC

Start > run > regedit {enter}

Navigate to >HKey Local Machine \ System \ Current Control Set \ Services \ TCPIP \ Parameters
Create the following
New DWORD : EnablePMTUBHDetect
Value : Hex, 1

And reboot the pc.


Any difference?
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ctunksAuthor Commented:
That worked!! Thanks. I have been struggling with this problem for weeks and looked at everything from the firewall to screen resolution.  Can you tell me a little bit more about this key and what it does?  How did you find it?

Thanks, again.
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Pete LongTechnical ConsultantCommented:
<grin> yeah its a nasty one :)

Its the VPN thats the problem and the way particular vendors set the MTU value across the VPN, most applications are unafffected but RDP gets very upset. Happened to me, and took 2 days to figure it out, and several hours on the phone to M$

Glad you are fixed and I could help you out :)

Pete
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