Error in rsync that I don't understand..

[Sri Ramkrishna]

[I wish the list archives were searchable, this most likely is a repeat
question]

We have a set of cron jobs that do regular rsyncs mirroring two trees.  This
has been pretty stable.  Over the weekend, almost all of them broke with this
message:

rresvport: bind: Permission denied
(15728) Error reading 4 bytes : EOF

Under what conditions does this error occur?  It looks like it couldn't
bind to a port because it wasn't allowed to.  But I'm not certain if
thats the correct translation.

sri