My server has the port: 25565 I portforward it using my netgear guide. i entered the right port and when i tested it again, it still says the error. I tried firewall but nope. i checked if my portforward was correct and it was.
ClassiCube actually sends packets to check if it is port forwarded, you could call it a fake player somewhat, the connection should get aborted within milliseconds though. So if it throws that error, your port forwarding must be wrong.
Yeah... i logged into my router and did all the thing like the starting port: 25565 to ending:25565. same thing to external start and ending port. then i logged out and check if it worked and still no. We;l.. i tried port opener or port checker. it said the port was closed on my computer ip address. also, Can you change it to another port like 25564?
Strange because i founded this: when i put my server public, the classsicube url has the error. when i put my server to private, the classicube url shows up. but cant be found on the list when you put it in public again.