Seriously NC - my advice is to make fixing this GG error today, and keeping your community informed about it - priority #1.
You've already ****** off a great deal of us with the server mergers. Those of us willing to stick it out and see how it goes are getting slapped in the face with a GG error the very next day. Keep us informed, and you'll minimize your losses.
No, I have no firewall installed on local machine.
No, my router is not blocking anything outgoing.
Yes, I cleared my DNS cache.
Yes, I did run full check.
Yes, I am using English keyboard.
No, I do not have any third party program that would "steal" internet connection.
No, I have no proxy set.