Hi,
I have the same problem as Mike...
I have looked at the troubleshooting questions you suggested Sergi...
1) Yes
2) Yes
3) Yes
4) It was installed a few weeks ago
The one (big) difference we have is that my client is in the process of changing domain...we have installed the DCinterface on the two new DCs...but, in theory, all info is replicated between the two domains so there shouldn't be a problem should there?!
My client wants to create a policy so that only domain users can access the internet but obviously with this problem there are many users that dont appear, hence the SWG can't see what group (OU) they are in so it appears they are not in the domain...hence no internet access for valid domain users! Understandably he is not too keen on this happening!