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Windows 7 VPN with Server 2003

We have two laptops at a remote location, both of which connect via the default Microsoft VPN connection to our server.  one day both will work fine, but then the next, only one will.  It seems to be random.  one laptop works but the other gives an error 800.  But the previous day and the day after, both work flawlessly.
What's going on?
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Krzysztof Pytko
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Done.  Checked both articles.  The routr is def working, as I can connect with multiple devices, but only SOMETIMES can not connect with one laptop, as stated in OP.  At the same time that I experience problems connecting with the laptop, i can connect from other workstations and laptops with no prolems.  I have already recreated the vpnconnection on the laptop twice.
OK, check on VPN server in ports node if you have appropriate amount of PPTP or L2TP (depends what kind of VPN connection do you use) ports available :)

Maybe that's the issue ?

Uhm, there are over a hundred of each type.
OK, so your VPN server has appropriate amount of PPTP/L2TP ports :)
Have you tried to reinstall client OS, or reconfigure VPN server?

No.  Was looking for something a little less "scorched earth" than a format/reinstall.  :)
The client laptop WILL connect to the VPN server... just not all the time.
OK, so maybe NIC drivers update on a client machine would solve this problem?

Ok, I am providing them with remote support, and they are only at the remote location once a week, so it is hard to get an accurate picture of what is going on.
1) They have two laptops which each connect to a Windows server vpn.
2) From location A, both laptops can connect and function perfectly well.
3) From location B, only ONE laptop at a time can connect, it doesn't matter which one connects, as soon as the vpn connection is up, the other can not connect.
4) At location B, they are using an intellinet wireless router (provided by the facility's IT)
The intellinet router at location B was at falt - it was only allowing a single vpn tunnel go through at a time.  Replaced the roter and all was well.
The router was at fault after all.  It would only allow one tunnel at a time.