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Powerhousecomputing asked on

VPN in SBS - Connects Fine...... Explorer Problem

I have a VPN set up in SBS2003 - all was working fine but for some reason now when i connect it says authenticated and that's great but when I open up the Server's IP address in Explorer the box pops up and then disappears again - and the same thing happens if I click run and type the IP of the server in too (local IP that is).  What's happening?
SBSVPN

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Last Comment
Rob Williams

8/22/2022 - Mon
Rob Williams

Dropped connections can often be caused by too high an MTU (Maximum Transmission Unit) size, especially if it is a lower than normal performance connection. It is recommended you change this on the connecting/client computer and when possible, it's local router. The easiest way to change the MTU on the client is using the DrTCP tool:
http://www.dslreports.com/drtcp
As for where to set it, if not using automatic, it has to be 1430 or less for a Windows VPN which uses PPTP if using the basic client (1460 for L2TP). There are ways to test for the optimum size of the MTU such as:
http://www.dslreports.com/faq/5793
However, this is not accurate over a VPN due to additional overhead. The best bet is to set it to 1300, and if it improves the situation, gradually increase it.
A couple of related links:
http://www.dslreports.com/faq/7752
http://www.chicagotech.net/vpnissues/vpndorp1.htm
ASKER
Powerhousecomputing

the connection is not dropping.  The connection is fine and works ok on other computers too.  Its just on this computer (am using Vista Business) when I open up explorer and point to the server I either just get a box that pops up and then disappears or the box comes up and shows just users and printers, but these seems to be local offline versions.
ASKER CERTIFIED SOLUTION
Rob Williams

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