I saw that there was another thread on this, but I didn't see the answer there and it didn't look like exactly the same issue.
I've been playing the game for an uncountable amount of years. Today I received a message when trying to launch the online arena that read, "If you are using a firewall such as Zone Alarm....." It eventually timed out and the Alt Route didn't work.
I haven't changed any firewall or internet settings, why would I suddenly be getting this message?