First off, wrong section.
Now on to the actual issue:
Whenever you can't see the servers after launching gunz there are usually a few things to check.
-Antivirus/firewall (make sure that gunz is allowed and try turning them off to see if that helps at all)
-Try Reinstalling and updating using Gunzlauncher.exe or aeria ignite. After you uninstall gunz, be sure to delete the remaining files before installing it again. May help to turn firewall/antivirus off during the updating process.
-Last time you were able to play gunz
-Location (if you're using internet from a university, college, or public area they may have a firewall within their router blocking access to games and such)
That's pretty much it. Keep us updated on the issue!