Arma 2 Overpoch joining sever problam?

Hi when I try to join a overpoch server it will either kick me out saying session lost or registration failed could not resolve host name

this hasn't happened to me before please help

Does it happen to only one server, or multiple?

This happens to me. but i get Authentication Time-out. Happens on every server regardless the version or mod

yea I have tried literally every customcombatgaming server and some other ones