Since at least a year now, I am doing nightly data replication via VPN offsite to another DSS. Since some weeks the replication process does run forever. And because it is still running, the next night the process is not starting again. I have to stop replication manually and start it again. When I look in my gateway monitor (looking for the total traffic at my VPN gateway), I see that replication starts (huge traffic for some minutes) and after some minutes (this time is different for any try), the traffic goes done, but the replication task in DSS does not stop.

In the last manual tries, I received one time also the error "Error 12 : Error in rsync protocol data stream protocol"

Could I get some more logs about this process?
What could be the problem here?

Both dss have the same version: 6.0UP90.8101.5845 64BIT
I also had a ping running to monitor VPN connection. Everything looked fine with VPN.

Any idea?