Outlook 2003 claims "Disconnected" over VPN

[CaspaMcNasty]

Hi,
Not sure whether this is an Outlook/Exchange issue or a Cisco VPN issue.
In our office we have a Windows 2000 server running Exchange 2003 Enterprise, all of our clients run WinXp and Outlook 2003. In the office all clients can connect happily with Exchange and send and recieve mail.
We also have a Cisco VPN Concentrator 3005 which provides a VPN tunnel to clients who have either a Cisco VPN Software client which they run when they have connected to broadband or a hardware VPN solution provided by a Cisco 837 router.
When our clients are connected via VPN Outlook states that it is "Disconnected". We can ping the Netbios name, the FQDN and IP address all with success. NSLOOKUP can also resolve the domain name and IP proving DNS is working OK but Outlook claims that it can't find the server.

Has anyone come across this before or can shed any light on this? If you need any more info don't hesitate to ask.

Regards
Mark

 

[xmsre]

MTU size. Specifically if you have MS05 019 on the clients or 2K3 SP1 on the server.

Try ping with -L and -f. Try different sizes starting with around 1500 and working your way downward until the ping succeeds.

 

[CaspaMcNasty]

Thanks for the swift response. The clients have got MS05 019 installed. When I do the ping i get the response "Packet needs to be fragmented but DF set" when I reduced this to mtu size of 1400 I get the message "Request timed out". Is there any other way of testing this other than starting at 1500 and deducting 1 everytime? Some little software tool maybe?

cheers
Mark