Can't connect to medicare.gov

Hello all - I'm an ATT Uverse user in Western Connecticut. I'm a Mac user, OS X on several computers, several versions of X at my disposal (10.6, 10.7, 10.8). I'm well-versed on the Mac (Mac user for 27 years), but this has me stumped for the moment, and it seems to be UVerse-related. I can't access the "medicare.gov" website using standard methods (read on). I -can- access other "gov" sites, such as "loc.gov", "irs.gov", "va.gov", even "healthcare.gov". But again, I -can't- reach "medicare.gov". I have tried several browsers including Safari, Firefox, iCab, an old version of Camino. None work -- I enter "medicare.gov" in the URL entry bar and..... nothing. This is on ALL the Macs in the household (four total), and I've switched between older and newer iterations of the OS -- again, nothing. I -have found- something that works, but only part way: If I use the EPIC privacy browser and choose the option to hide my IP address via a proxy server, it connects right up to "medicare.gov". However, using such a proxy limits my ability to interact with the site (example -- cannot get "find plans" search to work). Interestingly, if I chose to run Epic in "non-stealth" mode (IP address NOT hidden via proxy), Epic behaves just like the other browsers above -- i.e., no connection. Also -- if I use the Tor browser, I can get "part way into medicare.gov", similar to with Epic in stealth mode above. As an aside, I can go anywhere else on the net I want. No problems connecting to sites, EXCEPT for "medicare.gov". I've come to the conclusion that something insofar as UVerse is concerned is blocking the connection, or, more correctly, is preventing the medicare.gov site from establishing the connection. It could be some [seemingly] insignificant software or hardware setting in the UVerse Residential Gateway. I'm guessing it's software because I can bypass it by using EPIC in stealth mode (which I believe is establishing some kind of VPN with another site?). Doing some googling, I've encountered postings from others (who seem to all be Windows users) who have had pretty much the same connection problem with the medicare.gov site. I even saw posts which said in some cases the only resolution was to change out the ISP's modem. I'm wondering if anyone else has encountered this problem with the medicare.gov site, and if so, how you were able to overcome it. I'm particularly interested in comments from Mac users.... Thanks, - John