Did what you've asked. Every point was done, except one. At creating a forward, where I'm supposed to set the WAN IP. I have only a radio button there titled
Any. After I've set it all up, the monitoring server is still saying no route to host:
USER@omd ~ $ telnet 37.220.XXX.XXX 6556
telnet: connect to address 37.220.XXX.XXX: No route to host
37.220.XXX.XXX is my IP address, that can be seen from the world. In the test I've tried to telnet on the specific port into the local machine.
If this works, then the monitoring works too. Maybe this is not NethServer releated? But it must be, because this error came after I've replaced my CentOS 7 server with NethServer. Before that, this function worked perfectly. I've opened a port on firewall-cmd and forwarded it directly.
I also want to point out, that creating a firewall object was not really nedad I think, because there was already an object with the same information. But never the less, I've created another one.
And it is still not working