Problems with PPTP VPN and DLink DI-808HV

Archived from groups: comp.dcom.vpn (More info?)

Hi,

We have a Dlink DI-808HV router that implements its own VPN server
"in the box". I've set it up as a PPTP server with MPPE encryption
and, most of the time, it works fine.

Occasionally (i.e. once a day or so) when a Windows client attempts
to connect to the VPN server the negotiation will hang, during the part
where Windows says "Verifying user name and password" or "Registering
your computer on the network". Eventually Windows times out.
Sometimes retrying three or four times will fix the problem, and
sometimes it will persist.

This happens with different PC clients, running both XP home and
professional, and with different Internet paths (e.g. coffee shops,
hotels, GSM/GPRS cell modem, etc) back to the 808HV. Resetting the
router, if there's someone around to do it, always seems to cure the
condition for a while.

The same PC, with the same network path back home, will connect just
fine some times and fail others. Turning off encryption doesn't seem
to help. I've been in touch with DLink technical support and even the
second or third level support guys (the ones that sound like they know
what they're talking about) don't seem to have a solution. At least
they're honest about that :-)

Has anybody else seen this problem?

Thanks,
Bob Armstrong