Maybe this is an idea.
When you join a server with an extracted client,
hradba get an error and disable himself but you can still play.
(something from my log file)
2004-07-06 15:51:53.183 - ER - HradBa Exception at msg: 207
2004-07-06 15:51:53.245 - ER - HradBa Disabled
Maybe its possible to disable hradba on the server side.
So try to let crash hradba on the server remotely.