Authentication 'failure' success

[Michael T. Babcock]

We are using OpenSSH (portable) version 3.0.1p1 on Linux 2.2.14-10 with 
RedHat's distribution of PAM 0.72-20.6.x for rsync'ing RRDTool data 
between two machines (among other things).  When running 'rsync -essh 
-avz', everything works fine but the system log on the sshd side shows:

PAM_pwdb[8021]: authentication failure; (uid=0) -> rrd for sshd service 
sshd[8021]: Accepted publickey for rrd from 216.168.105.35 port 3908 ssh2 
PAM_pwdb[8021]: (sshd) session opened for user rrd by (uid=0) 
PAM_pwdb[8021]: (sshd) session closed for user rrd 

Lines 2, 3 and 4 seem fine, but what's with the first line claiming 
there was an authentication failure?  Any other information necessary 
can be easily providedm, but I'm not subscribed to this list so CC: me
on replies.
-- 
Michael T. Babcock
CTO, FibreSpeed Ltd.     (Hosting, Security, Consultation, Database, etc)
http://www.fibrespeed.net/~mbabcock/