I have setup a PPTP VPN Server on a Snapgear SG300 router. We are using local account names (which match the AD names) but passwords are complex (30 characters generated) vs the fairly insecure AD passwords.
This is the same config we are using at other sites and which has worked fine. Yet at this site, I have had issues for both the first two users setup.
In this scenario, they are connected to the domain. Remove the UTP cable and connect to the Internet via a 3G card. Connect to the VPN via the PPTP client.
When they then click on the F: drive (\\server\data) they receive a message "Local device is already in use."
If they try to browse the server via explorer they will be asked for credentials which aren't accepted (i.e. entering their AD username & pw in the format \\domain\user isn't accepted).
Attempting a net view of the server returns "System error 5 - access denied"
I've checked all of the client settings and all appears fine.
Suggestions, or a link to best practice for this type of config (PPTP to firewall to server) would be much appreciated.