W:ET Punkbuster Client: Failed to resolve etguidauth.evenbalance.com

[Mystik]

If reinstalling ET doesn't fix it, try reinstalling Punkbuster too.

Also restarting your router might fix it.

More possible solutions:
https://fearless-assassins.com/topic/734...alancecom/
http://fearless-assassins.com/topic/7330...onnection/

Also if you reinstall both ET and Punkbuster, make sure that the pb folder inside ET folder gets removed too when both have been uninstalled, if not, then delete it manually.
And like others said remember to save etkey and cfg somewhere save so you can restore them after reinstall.