So, it is getting through the authentication stage. As a test, I put in an incorrect password and it immediately tells me 'the logon attempt has failed' - just what I would expect.

Now, when I try through the VPN, it will try and connect - after putting in the logon account and password info, then gives an error message that 'an internal error has occurred'. The servers and PC's are configured to use the nonstandard port (not doing a port translation to 3389) And it had been working fine for quite a while. Have all the protocols defined, rules, etc. On most, using a non-standard protocol port # (say 41265 vice 3389). With the Sophos VPN running from a remote PC, I could RDP to several internal servers and a workstation or two.

This problem just started (well, noticed it last week, but may have been going on longer).