Suddenly Problems with Data Replication via VPN

[prahn]

I just downloaded log files and had a look at tests.log: There are no dropped packets at all!

eth2      Link encap:Ethernet  HWaddr 00:1B:21:04:9B:8E  
          inet addr:192.168.1.4  Bcast:192.168.1.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:26516354 errors:0 dropped:0 overruns:0 frame:0
          TX packets:44536409 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:11838663423 (11.0 GiB)  TX bytes:54379820600 (50.6 GiB)
          Interrupt:16 Memory:ea220000-ea240000

I just updated destination dss to latest version, the other one will follow some days later.
Is it not possible to see the log of rsync itself?

[To-M]

I would also look at the rsync.log as well and look the date that it happened in the log to see if there was another error that happened just before the error 12.

[prahn]

Strange, the last entry in rsync.log is from 2011/02/09. Why that? Where can I get actual log data?

[Pi-L]

Is the date set ok in DSS?
Events will be logged in rsync.log on destination, is it the one you are checking?

[prahn]

Yes, the dates are set ok on both DSS servers, I just confirmed this. But of course I was looking on the source DSS for rsync.log!
On the destination there is a log, but it is not really helpful:

2012/08/02 21:52:07 [1663] name lookup failed for 192.168.1.4: Name or service not known
2012/08/02 21:52:07 [1663] connect from UNKNOWN (192.168.1.4)
2012/08/02 21:52:07 [1663] module-list request from UNKNOWN (192.168.1.4)
2012/08/02 21:52:07 [1664] name lookup failed for 192.168.1.4: Name or service not known
2012/08/02 21:52:07 [1664] connect from UNKNOWN (192.168.1.4)
2012/08/02 21:52:07 [1664] module-list request from UNKNOWN (192.168.1.4)
2012/08/02 21:52:19 [1754] name lookup failed for 192.168.1.4: Name or service not known
2012/08/02 21:52:19 [1754] connect from UNKNOWN (192.168.1.4)
2012/08/02 21:52:19 [1754] rsync to kunden_bup/ from root@unknown (192.168.1.4)
2012/08/02 19:52:19 [1754] receiving file list

Does the 2-hour-time jump means anything? I started this rsync manually at 21:52, now it's around 30 minutes later and rsync is still running on the source machine. But in fact, it looks like nothing is happening anymore... please look at the attached screenshot of my traffic monitor. After around 10 minutes, rsync stops producing traffic... :-(
https://www.hidrive.strato.com/lnk/LmINgmDk