We have replaced the Qtracker master server for HexenWorld. The new master server address is master.hexenworld.org:27900. If you are a server admin, please modify your hexenworld config files to point to the new master server.
An annoucement was posted in the Qtracker forums that Gamespy emulation will be permanently shutting down on 8/1/17. The GS3D client provided with HeXen II will still function as intended. HeXenWorld relies on the Qtracker master server to make servers public in GS3D. We are working on a fix. Stay tuned.