ET (Enemy territory) has been messed up lately with master list redirect and hacking issues. In order to stop it, please do the following:

1. Put both ws2_32.dll and wsock32.dll next to your ET.exe
2. It will block all redirect messages from server and blocking all auto redirects.

Note - Please be careful which server you join. Admins can push trojan/virus, etc to your PC through download and infect your PC and in result use it to DDoS any server. So pick your servers, wisely. 

https://fearless-assassins.com/files/file/1755-et-masterlist-hacking-and-redirect-fix-for-players/
https://www.crossfire.nu/threads/48410/et-patch-against-master-list-redirect

Play safe and Happy Fragging!
Fearless Assassins Community
https://fearless-assassins.com