Unkown host error playit

Does anyone know why I cant connect to my server without the port next to the domain? When I add the port I can connect to it but without the port I get the error unkown host or connection timeout. Anyone knows why? added-ii.craft.playit.gg with port
added-ii.at.playit.gg:61740 Version 1.17.1+.

nvm I found the reason its my router blocking me from doing this so It dont need any fix . If my computer is connected to another wlan router I can join it normally