>Yes, if I disable Norton Farewall completelly, the site will open just fine. However, I'm a little bit afraid to do so. Trying to adjust settings in Norton Farewall didn't help, e.g. I added all UT sites to everywhere and still no luck. Hopefully their patch will resolve the problem.

Yes, and the worst thing in all that, when they simulated that yesterday, they didn't have any problem at all. They didn't even have to enter the sites in the list of trusted zone in any of those two software. But, suddenly, if they keep testing, at one point, the sites will be blocked. This is a really bad bug in the software.