I have had this issue for well over a year now and it has made playing Arma III on multiplayer very frustrating. The problem lies in detecting servers in the server browser. With a default filter in the multiplayer server browser it would seem that a vast amount of servers are not shown. This is the server list that I receive with a default filter and sorting by the most populated servers: https://gyazo.com/17e5623a142f925cd0c31d8cd5effa81

As you may be able to tell after comparing it to the result of your server list I am missing a not so insignificant amount of servers from the server list. The issue does not stop there however. I am also unable to connect to these "missing" servers at all.

When trying to connect to this wasteland server (198.205.113.103:2302) via remote this is the unpleasant result that I get: https://gyazo.com/68d5d7a9c5cbb0e4312c79b6c2e6cab2 and https://gyazo.com/a688ef63a53f25e36d279c2a983496a2. (no results)

In another approach I have tried to connect to servers that my friends are playing on through the steam game overlay. After clicking on my friend's name and clicking on game info, the steam overlay tells me that the server is "not responding".

I have tried dabbling with my firewall, reinstalling and I am not playing with any mods. This problem has made this game all but unplayable for me because I cannot join servers with my friends. I do not know whether this is a network issue on my end or something else but I wouldn't mind hearing what other people have to input.

How many servers are other people detecting in the multiplayer browser? Is there a solution to this issue? I really appreciate any responses I receive.