I need help reaching sk server in the local network

[sailstevo]

Good morning,
I just installed the signalk server on my boardpc. OS is mxlinux. I can get access to the server on the computer itself, via 127.0.0.0, also with the hostname.
Problem is, I cannot connect to the server from other devices, laptop, tablet and so on. Just not reachable.
The router is a teltonika 956. Already tried to put some rules in the firewall and similar stuff, without success. I would be very happy for some help. No idea wereto start by myself.
Thanks,
Stefan

[sailstevo]

I found it myself:
had to add a rule in the OS firewall.
Stupid waste of time, was easy enough.