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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?

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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:
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:
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:

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.
Rob Williams

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