Bump.
The firewall solution does NOT work. This is a very common misunderstanding, it isnīt related to the firewall.
I just recieved this error updating from a 2009 build to another 2009 build, an update message box recieved today. After installation, I couldnīt login anymore.
Tried reverting back to old versions, all .dll refreshes, socket refreshes, dns flushes, all the solutions found on the internet but they do not work.
So.. if anyone could help me...