Certain Sites Work In Proxy, But Not In Browsers

I have a recent problem with trying to browse a couple of my regular websites. When I try to view them I get "Firefox can't establish a connection to the server at" messages, instantly with no even trying to access the domains. I tried ping and tracert commands in the command prompt, and both failed to connect to the domains. However, when I go to any proxy/unblocking website and enter these sites, they will load fine through proxy so I know they're online. They were showing up as "down for everyone" a few days ago, checking via websites that check domains, but they're working now.

I checked my hosts file, they're not being blocked through that. It's not a Firefox issue as even IE won't load them. I said before, they'll load via proxy websites but not in my browsers through normal use. I have no idea what's blocking these sites or why I can't view them. Could it be an issue on the server's end not letting me connect? Blocking via my ISP? Or just some other thing with my PC? Though I can't think of why these 2 specific sites would be giving me problems, neither is related to antivirus or whatever and all my scans with MSE and Malewarebytes are coming up clean for malware. I did run Windows Update a few days ago, but it was mostly MSE definition updates and 1 Windows 7 update, nothing really special, and I think this started well after I ran the update. As it is I'm basically clueless. And even though I can load them in proxy sites I can't use them as they don't really work through free proxies due to javascript and such.