Cannot log in into Icecrown realm

I'm having an issue playing on Icecrown realm. I get into log in screen, choose one of my characters and after loading screen it just says "Disconnected from server". I tried to log in on Lordareon and it woks fine, but for Icecrown I'm having issues since yesterday.

Aynone else having this problem?

Seems like the issue is my own pc, cause i can log in from other one. Not sure what's causing this problem. I'ts happening only for the "Icecrown" realm. I played just fine yesterday, and didn't do any changes to my pc...