The last days a lot of players got kicked by pb.
Becuase two days ago, Evenbalance released a new Punkbuster update.
It has been over 6 months since the last update for Enemy Territory was released.
"Version 1.747 of the PB Server for ET has been released to our PB Master Servers for auto-update and to our website download page.
This is a maintenance release."
If you are getting kicked from servers with messages like 'General PB Client Authentication Failure', run the pbweb.exe program from the 'pb' folder to update your installation.