Connecting - Unable to Connect

I can't log into the game recently. It was working well until 2 days ago, and I haven't been able to log in since. When I enter in my password, it gets stuck in "Connecting" for a while, then it says "Unable to Connect" thereafter. I've tried to change the realmlist, delete the WTF and Cache folders; as well as the DNS flush. I've also tried to hard-reset the WiFi modem, which did not work. However, when I connect to other WiFi networks, I am able to log in. Anybody having the same problem? Any suggestions on how to fix this? Responses would be greatly appreciated. xoxoxo