[Dovecot] Dovecot auth problem on FreeBSD 4.10

Hello. I am trying to setup Dovecot on an Alpha running FreeBSD 4.10. I am simply trying the imap/pop3 protocols at this time. But with both protocols the log message I get is:

pop3-login: fd_send(5) failed: Bad file descriptor dovecot: child 275 (login) returned error 89

or

imap-login: fd_send(5) failed: Bad file descriptor dovecot: child 275 (login) returned error 89

I have tried various combinations of:

auth = default|plain|pam auth_userdb = passwd auth_passdb = passwd|shadow|pam|passwd-file

but nothing works. What am I doing wrong? Thanks.

Viren Patel University of Texas at Austin