Yahoo! to kill the YCHT protocol (Java Chat) - 19th April 2006 16:40:59 Yahoo! have announced that they will be stopping the Java Chat client in the following days. This means you must use Chat2.0 or Yahoo! Messenger
Yahoo! Chat - YCHT and Issues - 20th April 2006 11:59:06 The Java Chat client has finally died, along with the YCHT protocol supporting it. At the time of writing, Yahoo! Chat does not appear to be operational on the other two methods, that is Yahoo! Messenger and Chat2.0.
Update: Yahoo! Chat - 21st April 2006 12:54:02 Although it's working now, Yahoo! Chat is not working properly. Some rooms report full when they dont appear to be. Other rooms dont exist that used to. Many posts are still not making it to chat rooms or not being seen by all.