Anyone wishing to play on the JDRGaming BF2 server must first install both the FH2 mod and Coop Patch C. Both of these files are available in the Files and Downloads section of this site.
Unfortunately, despite the name of the server including "COOP Patch C", it looks like people are trying to join the server without first installing Coop Patch C. Normally, when you do that, your client will crash and the server won't be affected. But for some reason, when some players try to join, the server also crashes. In an attempt to avoid this, I have now added a password to the server. The password is "cooppatchc".
I'll publish the password in a couple of other places (GameTracker, XFire) to make it easier to find. I'm not trying to keep people out of the server, just trying to make sure they understand that there's no point joining if they don't have Coop Patch C installed.