For some reason nobody can connect to eachother on a network. We also cannot host servers that anyone can join(in or out of the network). Joining outside servers is just fine, as is much anything going out.
I have enabled pretty much every port I have seen come up and still nothing, I have taken myself out of the DMZ and still nothing, people on my network cannot join the server. I have a linksys router and a switch with which everything is plugged into. We have tried programs that create an external server and still that does not work. Something seems to be hindering the computers from talking to eachother. On top of that we periodically get disconnected from any internet activity for a few minutes. Any ideas?