Why is Safari always rejected by att.net

sacremot

Every time I try to log into att.net via Safari (Mac 10.6.8 Snow L) ID and/or password is rejected, even when att.net contacts me, enters ID and password automatically for me, or when they authorize to change password. New password is not recognized. Talked to support umpteen times with same reply, "We're fixing it." Is this a problem with all internet accounts? I'm a late-comer to www. 

tallest skil

Works for me. The site, that is; I've no means by which to log in.

It does show my standard Yahoo! account logged in just fine, however.

mr. me

http://www.att.net/ resolves to http://att.my.yahoo.com/. Because I have a Yahoo! account that is already logged in, I have no issue at all using Safari to access the site.