How to Fix: Unable to Connect - Call of Duty: Black Ops II

Tried playing multiplayer CoD: Black Ops 2, only to find out you can't connect?

If it cannot sustain a connection.

1) Run the game as an admin using administrator mode (right click the game -> run as administrator)
2) Disable your firewall (software and hardware / nat firewalls)
3) Enable gaming mode on your wireless / wired router
4) Open the following ports: 4500; 3478-3479; 3658 (TCP/UDP)

Boom! You can now connect to the CoD Black Ops II server for multiplayer and matchmaking.

Hopefully that was able to help you fix your unable to connect Call of Duty: Black Ops II issue! It certainly was able to solve the problem for us!

Works on Windows 8, Windows 7, Windows Vista, and even Windows XP.

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