Ошибка 500

They're aware of the issue and are working on it.  In the mean time either use your history or a direct link to your world.  Or use this link

gamecdnorigin.alliances.commandandconquer.com/WebWorldBrowser/index.aspx.

It's easier to use the browser's history to directly access the right server, rather than blindly selecting it.

Проще использовать историю браузера для прямого захода на нужный сервер, а не подбирать в слепую

Main site is down but direct links work.

The link below is the direct link to Tib73. Replace 474 with the server number of your world. eg 472 is Tib72. Try 473,472,471,470... etc until you find your world. And save it to your bookmarks.

https://cncapp09.alliances.commandandconquer.com/474/index.aspx?langPreferred=en_US