Hi folk!  As you have probably witnessed already, Yahoo has messed with their protocol and no one can log in from the IM Gateway plugin right now.  Same goes for Gaim/Pidgin and Trillian, even though Trillian appears to have fixed already.  Interestingly enough, Adium X doesn't seem to be having problems.  I also didn't have to perform an update on a real yahoo client to log in, so it's not a "major" protocol change, just involves tracking down what is causing the problem.  The OpenYMSG devs are working hard to figure it out.  =)  I'm going to put out an emergency plugin release with only that fix in it when the fix is ready.  1.2.1a most likely.  Stay tuned!

In the meantime, you may want to disable yahoo on your server so that your users aren't bugged with "wrong username or password" errors.  If they have a big requirement for Yahoo at the moment, you may want to point them at the web messenger, available here:

http://webmessenger.yahoo.com/

You can track the issue here:

http://www.igniterealtime.org/issues/browse/GATE-401