You need to follow the instruction,
If you eject been the server and you can not reconnect is that the power was too high adjust, reduce to a minimum and try again, it may be that you could not reconnect you for 2 or 3 minutes if the power and too high ,
for me it was not working all the time, but 1 out of 3 times it works, I do not test for black ops 2 multi (mp) but it should work