Check out the Yahoo blog for the latest help on this subject ( 18 August 2009 )
http://www.ymessengerblog.com/blog/2009/08/18/help-with-sign-on-issues-in-yahoo-messenger-9-0/
My own advice is
1) Shutdown computer - power off the router for one minute - restart computer
2) Have more than one browser available for trouble shooting. Keep browsers up to date to incorporate all the
patches - I run Firefox, Google Chrome and IE. Keep one browser clear of add-ons and plug-ins.
Always have the browser you are using designated as default - even if you only have one
3) Download and run CCleaner daily - to keep your browsers fully operational
http://www.filehippo.com/download_ccleaner/
4) Make sure Yahoo toolbar is up to date
5) Sign in here to reset cookies
https://login.yahoo.com/config/login_verify
6) If you have a Yahoo email address:- drop the '@Yahoo.com' from your username to sign in
7) Check the date and time are correct on your computer
8) If you have your settings to sign in automatically and recently changed your password check this out
http://help.yahoo.com/l/us/yahoo/messenger/messenger10/messenger/mstacantsignin.html
9) Make sure your firewall has Messenger on the 'allow' list.
10) Set your status in Yahoo Mail to 'Offline'
May be you using any types of socks proxy to connect your yahoo messenger with internet....check that first and change it to Connect directly to Internet if not works...open your yahoo mail page ...there will be web messenger built in itself...both classic and all-new-mail version now having built in web messenger with mailbox....Good luck
I think you cannot login properly.
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