Please take a look at the note posted after reading the following.

I get onto Arma one day after getting off Arma another day. When I get to Multiplayer, I take a look at the Server List. Not a single server is showing. For my friends, the servers are showing, so I'm guessing this is a problem on my side. I spent 2 whole days trying to figure out what was wrong, but I found no resolve. I allowed it through my firewall, Set the filter to Default, reseted my Modem, and even uninstalled and reinstalled. Still nothing has been resolved. This has been troubling me because, I really love playing Arma III multiplayer and then suddenly all the servers have dispersed. Other games like Garrys Mod and Chivalry have Servers popping up for me, its just Arma III servers that won't pop up. I think its due to the new Update (SPOTREP 0000037) that just came out, because right when that update came out I wasn't able to get on any servers. I have had many good times on Arma III and I really don't wish for it to end.