I can offer two clues:

1) I experienced this on an XP system where a personal firewall had been
installed, but turned off.  Deinstalling the personal firewall (and
turning on the built-in one) solved the problem.

2) I recently experienced this on an XP laptop after upgrading
cygwin/rsync after several hundred successful backups.  After downgrading,
the problem has gone away.  I can only speculate why this machine is
unique, but perhaps it's a clue that it has two active networks.

> I have several windows clients (XP, vista, Win7) and on only ONE of the
> machines (vista) I am seeing this when I try to connect to rsync from
> *outside* the machine:
>
> 2009/08/27 23:20:10 [5840] rsync: getpeername on fd3 failed: Socket
> operation on non-socket (108)
> 2009/08/27 23:20:10 [5840] rsync error: error in socket IO (code 10) at
> /home/lapo/packaging/rsync-3.0.4-1/src/rsync-3.0.4/clientname.c(168)
> [receiver=3.0.4]
>
> Connections from localhost are fine.
>
> So I've looked at the code for this function and it looks like it's a
> translation from IPv6 to IPv4, but I've disabled IPv6 and it's still
> happening.
>
> Any ideas?


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