SBS 2011 Standard VPN login failure

I have a client who are running the SBS 2011 Standard with approximately 10 users connected.

VPN has been working fine for a long time, but suddenly they have now got problem. When trying to connect via VPN and login, it says wrong username and password (but they are entering the correct credentials).

Port 1723 is opened.

Any ideas of what could be the cause of this problem?

Thanks!


Regards,
Fredrik Hildebrandsson
Fredrik_HAsked:
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Cliff GaliherConnect With a Mentor Commented:
Any recent network changes? ISP change or router/equipment change? The most common reason PPTP VPNs fail is GRE is blocked. And I assume PPTP because that is the type of VPN that uses port 1723. GRE is its own protocol type, like TCP, UDP, and ICMP, so it isn't a matter of opening a TCP or UDP port. Equipment specifically has to support GRE forwarding/passthrough and be configured to pass it to the SBS server. Not all routers do this. So a seemingly simple router change can break PPTP.
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Ben VrijsenOwnerCommented:
did you change/update your server certificate by any chance?
I've seen certificates giving me those issues in the past...
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Cris HannaCommented:
Have you tried domainname\username?
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