Server not found / (shutting down?)

I did a new server install on Ubuntu 12.04 (had to downgrade for compatibility with other software reasons). Since this install, none of the clients find the server instance.

The server is running in a VM. The VM is pingable. the Urback webinterface loads perfectly via the browser on the server, and can also be called from other machines if so set up.

In the log file on the server (/etc/log/urbackup.log) I only have get a single line of info each time I restart the server, or I restart the urbackup service, which is “WARNING: Shutting down (Signal 15)”.

Running lsof -i :55413 provides no response
Running netstat on 55413 provides urbackupsrv “listening”

Any ideas?

EDIT: sorry - I missed the point about correctly setting the debug level in the log. Turns out the error I’m getting is “Sending Identity to client XXX failed” - repeated for each client on the subnet.

Have a look at this FAQ entry:

Problem sorted:

Disable the reverse packet filter by either
echo 0 > /proc/sys/net/ipv4/conf/all/rp_filter or
echo 0 > /proc/sys/net/ipv4/conf/ethX/rp_filter

where ethX is the interface you want to receive on.

You can change the default boot up values in /etc/sysctl.conf