[Dovecot] PAM, Active Directory, all users mapped to uid=0

[Matt Zukowski]

I'm having a problem with authentication using PAM, connected on the 
back end to Active Directory. PAM authentication itself works fine. We 
can log in to the machine using AD credentials without any problems. 
Each user is automatically mapped to uid's in the 10000+ range.

However, for some reason when the user logs in via dovecot, the user's 
uid and gid are showing up as 0. For example:

dovecot: May 01 11:22:47 Info: auth(default): master out: USER  3       
mzukowski       uid=0   gid=0   home=/home/URBACON/mzukowski
dovecot: May 01 11:22:47 Error: Logins with UID 0 not permitted (user 
mzukowski)

Is there a reason why dovecot might not be resolving the uid and gid 
correctly? PAM itself seems to be doing this right, since when I log on 
to the machine as an AD user, their UID shows up correctly as 10000+.

Thanks,
Matt.

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