Can't get onto dod server??!!HELP

[Matz]

ok, i was on dods and i cant get onto the ego server strand.!bang
it says things like invalid certificate.
does any1 know y and how it can be solved!?

 

[Matz]

It is now saying things like invalid userID ticket ???

 

[Morbid #2 - Banned]

Logout and log back into steam...

Do not CLOSE steam...

File -> Change User -> Log back in again

Problem solved.