Yahoo! Login Server Problems
And yes, I can attest that the problem still exists at 09:45 CDT -05:00 UTC (my sbcglobal.net e-mail account is a Yahoo! hosted service).
Via the SANS ISC Dialy Handlers Diary.
We have received a number of reports indicating problems with various parts of Yahoo! services (mail, IM, groups). These services all seem to work properly with cached credentials, so we suspect that there is a problem with part of the authentication system.Link.
We have _no_ confirmed information of what is the source of these difficulties, but will continue to monitor and update this diary when more information is available.