I have 2 Minecraft servers: one with the port 25565 and one with the port 25566. I have made the port release and both servers are running smoothly. I can join the 25565 server, but I can't reach the server under 25566! The consoles give no errors or similar. I'm also pretty sure I wrote Port and IP correctly. Hope someone can help me!
P.S.: I already asked a similar question, where I was answered with "Try localhost: 25566". The server is not running on my computer.
If possible try to use a little more distance in the ports. ZB. 10 steps
25565
25575
25585
25595
…
And check the log file on the server as well as the firewall of the server
As far as I know, port 25566 is also used in connection with 25565. Try one of a few numbers higher.
