My friend needs help :(

Ok so day right after the new tf2 layout came out my friend told him to join but it wouldn’t let him so he quit gmod and tried to join from steam but that didnt work. So once he was joining the server it stayed on connecting to server and then failed after 4 tries now its been a almost a month and now his gmod is doing it some1 plz help him

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typos :S

Is it a listen server or dedicated server?