Cant make Gmod servers anymore

My friend and i used do Gmod servers alot, and he would always host them. one day out of the blue i just all of a sudden couldnt connect. other people couldnt either, and he hadnt changed anything. his firewall settings are the same, so do you guys have any suggestions?

Did he get a new router or something? Is this a LIstening or Dedicated server?

nah. how do you check if its listening or not

is he hosting from his computer while he plays, does he have a dedicated machine?

Ask him to do sv_lan 0

Yeh I agree. Try that. If that dont work type heartbeat and see if that works.