[Bug 1300768] [NEW] Rsync fails with (very) old server.

[rew]

Public bug reported:


Does not work: 
Trusty Tahr. 
Rsync version 3.1.0
Protocol version 31

DOES work: 
Saucy
rsync version 3.0.9
protocol version 30


In both cases: "server side":
Suse 7.0
version 2.3.2  
protocol version 21

with both "client" side rsyncs I of course get: 
> Server is very old version of rsync, upgrade recommended.

but with the newer rsync I get:

Warning: No xauth data; using fake authentication data for X11 forwarding.
Server is very old version of rsync, upgrade recommended.
protocol version mismatch - is your shell clean?
(see the rsync man page for an explanation)
rsync: connection unexpectedly closed (0 bytes received so far) [Receiver]
rsync error: error in rsync protocol data stream (code 12) at io.c(226) [Receiver=3.1.0]

According to the manpage I can test the "is your shell clean" with 
  ssh oldserver /usr/bin/true > out.dat
but I get a clean file (0 bytes). 

I just checked: the "no xauth data" doesn't matter:

  rsync -e "ssh -x" vsuse:/etc/issue .

has the same problems.

** Affects: rsync (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1300768

Title:
  Rsync fails with (very) old server.

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