Suddenly Problems with Data Replication via VPN

[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