Can you can ping the web site address from Command Line?
1. START
2. RUN
3. Type cmd
4. OK
5. In Command Line window, type:
ping mail.yahoo.com
also try:
ping www.mail.yahoo.com
If both gives you 4 successful replies from their respective IP addresses then my guess is either:
A) This is a browser issue:
- Try cleaning all your browser cache and cookies and try again.
- Make sure your browser (and its version) is supported by Yahoo
- OR -
B) Try another -supported- web browser.
If you are not able to ping the web site from Command Line but other web sites can be accessed, then possibly the site is blocked:
- By your ISP (unlikely)
- By a security program installed on your PC (security suite or firewall, this is common on work computers and typically enforced on the firewall level or GPs or the application admin console in use)
- By a malicious software (possibly a Browser Hijacker or Trojan)
- Your IP/domain was blocked by Yahoo due to malicious request/activity from your end (this could occur only when your system was controlled by a hacker as a zombie node or by a powerful worm).