rsync - Nov 2006 - unexpected tag -55

Periodicaly rsync terminates with folowing errors:

unexpected tag -55 [receiver]
file has vanished: "<filename here>"

server log says:
file has vanished: "<filename here>" (in userdata)
writefd_unbuffered failed to write 4 bytes [sender]: Connection reset by peer
(104)

I'm didn't wondered with vanished file, but what is "unexpected
tag" and
"writefd_unbuffered failed"?

What is the cause of this errors?
Is it network problems or something else?

Thank you.

On Fri, Nov 03, 2006 at 05:06:52PM +0500, Yakov Hrebtov
wrote:
> what is "unexpected tag" and "writefd_unbuffered
failed"?
The unexpected tag error means that something either corrupted the data
being sent, or rsync is confused about what data is being sent over the
wire.  The former can happen if your remote shell is injecting chars in
the data stream (a remote command must generate no extra output).  The
latter can occur if you have restricted the rsync command that can be
run on the remote system, and rsync isn't getting told about all the
options that are in play.

The writefd_unbuffered error just means that the other side went away,
which is to be expected when it dies with the tag error.

..wayne..