Lan Search not working for Resilio Sync on Ubuntu 20.4 server


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I have to come back to a previous issue (Resilio Sync not listening to port 3838 on Ubuntu 20.04) which hasn't been solved.

In many case LAN search is not working for the Resilio Sync client on my Ubuntu 20.04 server as Resilio Sync is not listening to multicast on port 3838, which is required to LAN search. This happens often after a reboot and if a do a service restart of the resilio sync process it is always the case. 

If everything is fine netstat -npl |grep rslsync shows
tcp        0      0*               LISTEN      2448/rslsync
tcp6       0      0 :::40935                :::*                    LISTEN      2448/rslsync
udp        0      0  *                           2448/rslsync
udp        0      0*                           2448/rslsync
udp        0      0*                           2448/rslsync
udp6       0      0 :::3838                 :::*                                2448/rslsync
udp6       0      0 :::40935                :::*                                2448/rslsync 

In case it is not working it shows
tcp        0      0 *               LISTEN      1870/rslsync
tcp6       0      0 :::40935                :::*                    LISTEN      1870/rslsync
udp        0      0 *                           1870/rslsync
udp6       0      0 :::40935                :::*                                1870/rslsync


Previously triggering a network restart using "netplan apply" solved the problem as resilio started to listen to port 3838 after the restart. However this is no longer the case. A network restart doesn't change anything. Previously resilio detected the network restart and reloaded its network configuration (logged in sync.log), but seems to be no longer the case.

Any idea why Resilio is not binding to port 3838?

For the detail configuration files see my previous issue report mentioned above.

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