Our latest problem is players being kicked for stuff like this:
"RESTRICTION: Service Communication Failure : PnkBstrB.exe".
Bascially punkbuster has been updated to run under a windows service pnkbstra.exe and pnkbstrb.exe.
If you kill either of these processes off (e.g. in task manager), you will be kicked from servers running the latest PB updates - usually with an "initialization failure" message.
If either of these processes are blocked by firewallsoftware norton/zone alarm etc., you will get a comms failure as above and be kicked.
The 3rd option is the PB updates have failed for some reason, so you'd faile a PB integrity check.
SOLUTIONS:
1. press 'ctrl-alt-delete' and check the processes tab (XP) for these processes
If not there:
Start>Run> typer 'msconfig'
check in startup tab if you have disabled (enable if they are there):
PnkBstrA.exe
PnkBstrB.exe
2. adjust any firewalls to allow access to pnkbstra.exe and pnkbstrb.exe
3. download the punkbuster updates manually at http://www.evenbalance.com/downloads/pbsvc/pbsvc.exe