Hi Andre,
thank you for quick response!!
Ok I have now edited the settings and I put the “default” back on to Global Discovery Servers field and I added URL only on to the field above it named: “Sync Protocol Listening Address” but it still seems that PC outside of the network can not connect to the Relay although the port is opened and Relay server is visible to public. Regarding direct connections between the clients via FW I need some time to figure out this part, I found this with relay kinda more “logic” …
Btw I do not see any warning messages anymore but it still can not connect to the relay server, need to try a bit more…