when I was trying to create my own 1.7.10 forge server with Hamachi, this popped up and stopped everything
[18:00:26] [Server thread/INFO]: Starting Minecraft server on 188.8.131.52:25565
[18:00:26] [Server thread/WARN]: **** FAILED TO BIND TO PORT!
[18:00:26] [Server thread/WARN]: The exception was: java.net.BindException: Cannot assign requested address: bind
[18:00:26] [Server thread/WARN]: Perhaps a server is already running on that port?
Note: that IP shown above is my IPv4 address on hamachi