And yes, im hardlined in with ethernet, no wifi. always have been. I even switched those out as well. further to this, im referring fully to the multiplayer portion of the game of course, not zombies, which ive never installed and never will.
other games including previous editions of COD all work in multiplayer online except this one.
Hmm. The only possible workaround I can think off to really determine the main cause is to have another Steam account with Black Ops 2 be tested out on your PC and check if it would let you connect online. If it still won't connect, the issue may now be with the ports you have setup for the game.
Thank you for the response!
It seems that the issue was indeed a COD server side issue and has been rectified without my having to do any further troubleshooting. The last time this occurred was when Black ops 2 first came out and many could not connect due to server demand.
Ah well! Back to fragging!
edit: oh as an afterthought, these were the ports I forwarded and they have worked since day 1.