we have recently purchased a new Mac Mini Server with Lion last week, and I have set up users and turned on file sharing. The first few days I could get our PC's in office to connect to the file share by entering in the IP of the Mac Server in the search bar \\XXX.XXX.X.XXX and then I could enter the username and password for that user to connect. We came in over the weekend and now I cannot get my PC's to connect no matter what credentials I use. Even ADMIN credentials do not work. Now, Mac to Mac is not a problem, I have three Mac's that can see the server, but for whatever reason my PC's now do not connect. I have tried resetting users but this is just not working for me. I am new to Mac Servers so any help would be much appreciated.