No Roon Core after system reboot

I had to reboot my OpenSUSE LEAP 15.2 server. roonserver is started:

        jarfx:~ # systemctl restart roonserver
jarfx:~ # systemctl status roonserver
● roonserver.service - RoonServer
   Loaded: loaded (/etc/systemd/system/roonserver.service; enabled; vendor preset: disabled)
   Active: active (running) since Wed 2021-04-28 16:52:12 EDT; 2s ago
 Main PID: 15213 (
    Tasks: 63
   CGroup: /system.slice/roonserver.service
           ├─15213 /bin/bash /opt/RoonServer/
           ├─15218 /opt/RoonServer/RoonMono/bin/RoonServer --debug --gc=sgen --server RoonServer.exe
           ├─15262 /opt/RoonServer/RoonMono/bin/RoonAppliance --debug --gc=sgen --server RoonAppliance.exe -watchdogport=43539
           ├─15268 /opt/RoonServer/Server/processreaper 15262
           ├─15299 /opt/RoonServer/RoonMono/bin/RAATServer --debug --gc=sgen --server RAATServer.exe
           └─15342 /opt/RoonServer/RoonMono/bin/RoonAppliance --debug --gc=sgen --server RoonAppliance.exe -watchdogport=43539

Apr 28 16:52:12 jarfx systemd[1]: Started RoonServer.
Apr 28 16:52:12 jarfx[2350]: atom with <8 bytes is invalidatom with <8 bytes is invalidatom with <8 bytes is invalid>
Apr 28 16:52:12 jarfx[15213]: 00:00:00.002 Warn:  get lock file path: /tmp/.rnsgem0-
Apr 28 16:52:12 jarfx[15213]: 00:00:00.067 Trace: [childprocess] using unix child process
Apr 28 16:52:12 jarfx[15213]: Initializing
Apr 28 16:52:12 jarfx[15213]: Started
Apr 28 16:52:13 jarfx[15213]: has mp3float: 1, aac_fixed: 0

But both my iPad and Galaxy phone cannot find roon core.
What to do??

It is the firewall. What ports need to be opened?

These might help:

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