Can't connect to realm(s)

[Taem]

I had the same problem but as Ifd stated, it was due to my Firewall, however I also had a problem similar to yours. I would click USWest on the Gateway Selector and it would say something like, "Trying to find Gateway Selector." I couldn't log onto Battle.net for anything, even after uninstalling then reinstalling Diablo. I went to Blizzards web-site and went threw their automated FaQ Help but it was no help. At the end of the FaQ I had the option to Contact Customer Support, to which I wrote Blizzard my problem. I received a reply a few days later telling me to delete certain files and registry entries (sorry, but I don't recall which ones and I don't want to give you false information). I suggest if your problems persist, you do the same as me; it might save you a big headache!