I recently updated from an older build (don't remember which one...) and am now unable to host multiplayer servers, whereas with the older build I wasn't having any issues. When I try to host, the command prompt in the background says "Unable to advertise: unable to reach game server, make sure your ports are open." I have opened my ports already and checked multiple times to see if they were open. I also tried disabling my antivirus (not sure if this would effect anything, but hey, may as well.)
I'm not sure if this is an issue on my end or a problem with the newer build.
I can provide the longer message if necessary.