Hi there,
It looks like ircbot can't authenticate when the server is running the UNIX user/group database scheme. I tried setting it to "Logged-in users can do anything" (which is actually less security than I would like) and the bot will always NPE for anything but reporting:

====
Lewisham: EisHudson: build argouml
[3:44pm] EisHudson: Lewisham: Error java.lang.NullPointerException
====

If I turn off all security, and "Let Anyone Do Anything", the bot will build.

It looks like the problem is this, from my catalina logs:

====
WARNING: IRC notifier plugin couldn't authenticate against Hudson: org.acegisecurity.BadCredentialsException: pam_authenticate failed : Authentication failure; nested exception is org.jvnet.libpam.PAMException: pam_authenticate failed : Authentication failure
====

Kohsuke mentioned to add to the ticket that ircbot should send full stack traces to the logger. I have a default logger set up, but nothing appeared there, only in the catalina logs (no full stack trace there either), but I'm half convinced that's a dodgy set up I have

Thanks!