Yahoo Messenger Sign In Problem
Yahoo Messenger Services recently change some firewall settings that’s why most of users have sign in problem.
All the Older Version of Yahoo Messenger will no longer be able to connect through firewall.
So You Need to UPGRADE the Yahoo Messenger with 9.0 Version then you can signin Under Firewall.
Download Yahoo Messenger 9.0
Yahoo! Messenger 9.0.
What is a firewall?A firewall is security software that prevents unauthorized access to your computer. Many company networks and some home networks have firewalls to keep their computers more secure. Firewalls protect against viruses and other types of malicious software.
Yahoo Trick if you Don’t want o upgrade the Yahoo messenger and you want to run it under firewall setting just change the Connection Preferences