Originally posted by Krinkle27:

.. just says need to join a server on 0.212.7 and now it does it for 0.212.9 ..

?

You, your friend and the Server must have the same version.

If this is already the case then i can only guess. Maybe the reason is that one of you are still on the Public-Test 0.212.9 Version and not in the official 0.212.9 Version. Make sure you have disabled the Public Test.