rsync - Oct 2011 - rsync connection/transfer error

Hi All,

I am somewhat new to rsync and am looking for some guidance. I've been using
it successfully for a couple months syncing CentOS updates from a university
mirror with the following specs:
rsync version 2.6.8 protocol version 29
rsync -artv
rsync://mirrors.usc.edu/centos/5.6/updates/i386/RPMS/--exclude=debug/
/var/www/html/centos/5/updates/i386

Everything works fine for this connection and sync.

I am attempting to do the same sync on a different network which is failing
with the following:

rsync version 2.6.8 protocol version 29, rsync version 3.0.6 protocol
version 30 (both versions fail)
rsync -artvvvv
rsync://mirrors.usc.edu/centos/5.6/updates/i386/RPMS/--exclude=debug/
/var/www/html/centos/5/updates/i386

[client] add_rule(- debug/)
opening tcp connection to mirrors.usc.edu port 873
note: iconv_open("UTF-8", "UTF-8") succeeded.
sending daemon args: --server --sender -vvvvlogDtpre.is .
centos/5.6/updates/i386/RPMS/
rsync: read error: Connection reset by peer (104)
_exit_cleanup(code=12, file=io.c, line=759): entered
rsync error: error in rsync protocol data stream (code 12) at io.c(759)
[receiver=3.0.6]
_exit_cleanup(code=12, file=io.c, line=759): about to call exit(12)

I have searched quite a bit on the errors and have not found anything
helpful as of yet. I set up an rsync server running rsyncd to attempt
connection from this network.

Here is the output to the server log:
2011/10/24 11:47:44 [11616] connect from network.failing.com(xxx.xxx.xxx.xxx)
2011/10/24 11:47:44 [11616] rsync: read error: Connection reset by peer
(104)
2011/10/24 11:47:44 [11616] rsync error: error in rsync protocol data stream
(code 12) at io.c(614)
[receiver=2.6.8]

Here is the output from the failing network system:

rsync -artvvvv rsync://rsync.server.com:/var/www/html/centos/5/updates/i386
/var/www/html/centos/5/updates/i386
opening tcp connection to rsync.server.com port 873
note: iconv_open("UTF-8", "UTF-8") succeeded.
sending daemon args: --server --sender -vvvvlogDtpr .
var/www/html/centos/5/updates/i386
rsync: read error: Connection reset by peer (104)
_exit_cleanup(code=12, file=io.c, line=759): entered
rsync error: error in rsync protocol data stream (code 12) at io.c(759)
[receiver=3.0.6]
_exit_cleanup(code=12, file=io.c, line=759): about to call exit(12)

My suspicion is that it might be a firewall issue (network, not local
system) but I don't handle the network firewall on this network. I asked
them to open 873 tcp/udp to the machine and they say it is done so. Prior to
the change the rsync attempt just hung and timed out.

Any suggestions to trouble-shoot the issue would be greatly appreciated. I
am kinda stuck on what to try next. Are there some test I can run to
pinpoint the problem?

Thanks in advance.

Best regards,

Herb
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Hello,

Is your output on this problematic network similar to the following : 

$ telnet mirrors.usc.edu 873
Trying 68.181.195.4...
Connected to hpc-mirror.usc.edu.
Escape character is '^]'.
@RSYNCD: 30.0

Also, what happens if you add -n (--dry-run) to the following command
:
> rsync -artv rsync://mirrors.usc.edu/centos/5.6/updates/i386/RPMS/
--exclude=debug/ /var/www/html/centos/5/updates/i386
If it is working on from networks (which it seems to be) then I suspect there is
a problem with the connection.

Is the firewall opened for connections on port 873 to all systems on the
internet? The reason I ask is because you could start an iperf
<http://iperf.sourceforge.net/> server (operating on port 863) on a remote
system and see if connections works from the problematic network/host and what
kind of throughput you are getting. Perhaps the connection opens but once data
starts being passed something is going wrong?

The other thing is that you could setup an rsync server on a different system
and see if it has the same problem. With such a test you should see the same
issue if it is a network issue.

As far as I am able to see the mirror you are connecting to for the source seems
to be working fine <mirrors.usc.edu>. I suspect there is an issue with the
network connection or host.

Check the environment variables on the system for anything which may be causing
issues. Also, you if possible you could try building a copy of rsync from source
and see if that helps?

Finally, have you attempted the same rsync command from another system within
the problematic network? If so what was the result did it manage to pull the
data down from the server?

Hopefully, at least some of the information above is helpful =<:^)


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