The latest version shipped with a small problem that prevents Duffers servers from showing up in the server browser. To remedy this, find the DuffersUser.ini file in the /Duffers/System folder. Find the '[DuffersGUI.DGMultiplayerBrowserBase]' section and set 'bStandardServersOnly' to FALSE. Start Duffers and servers will now be visible in the Internet server browser. This will be the default setting in future versions.