Server help

Um whenever I start a server and Ask a friend to join, he says it says it says that ie cannot connect to the server and the server isn’t responding, Why is this?

Forward yer ports!

Honestly, we’re going to need more information than that…
Router model, firmware, listenserver/server.config…

agreed! this’ll improve response times for any server request. and get your firewall to make an exception on gmod