I'm an administrator on two different SBS 2011 servers. Both servers are running MS Exchange. They are on different physical location, different hardware, different domains both internally and externally. The only thing they have in common is the ISP.
Problem is, that I and some of my colleagues can't access the servers from our WiFi connection at home (ADSL). Our ISP's are different from each other, and no one of us have the same ISP as the servers. FUnny thing is, that we can connect to the servers if we use a 3G/UMTS/LTE connection, so I'm guessing that the problem is in our ISP's DNS routing. Another thing is that I sometimes can access the servers using my WiFi at home and some times I can't. Most often I can't.