[Dovecot] "logins with UID ... are not permitted"

hi,

I've just upgraded our dovecot installation to the most recent debian package (0.99.20050712) and now I'm running into some weird problems. Virtual (LDAP based) users cannot login anymore, the logfile shows this:

-------CUT------- dovecot: Aug 02 12:34:25 Error: Logins with UID 200 (user some.user) not permitted (see first_valid_uid in config file) -------CUT-------

yet /etc/dovecot/dovecot.conf has this for the mentioned parameter:

first_valid_uid = 1 first_valid_gid = 1

"regular" users can login however ...

any ideas?

udo

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