The same problem here:
[Tue Apr 23 09:09:08 2013]: Verifying 178.19.109.233:27015 (178.19.109.233:27015)
[Tue Apr 23 09:09:09 2013]: Got KEY (cssbeta) from 178.19.109.233:27015
[Tue Apr 23 09:09:09 2013]: Server reply: 90000GameUI_ServerRejectNewProtocol
[Tue Apr 23 09:09:09 2013]: FAIL. Server denied me.
Can you add this server please?