Clear browser cache (or delete temp internet files) via tools>options
SOURCE: whenever try to open the login page of yahoo, it
following step can fixed your problem
Strange as it sounds, your systems' time must be synchronized to the actual time. Although your cert's may be current, the time is unsynchronized, & doesn't match the sites certificate parameters.
Right click the system tray time clock> Adjust time & Date> Internet time> Update now. (Make sure your system is set to 'Automatic Synchronize...' while you're here)
Another possible fix:
With Internet Explorer, go to Microsoft Updates, then select the 'Custom' button (not the 'Express'). That will tell you all specific updates for your computer (hardware & software) and in this case the certificate updates.
Note that some Certificates having MD-5 'hash' authentication method, may have been hacked, so it's important to have your system's time & root certificates up-to-date, otherwise a 'Cross Site Request Forgery' hack is possible.
("Security Now" #166)
SOURCE: Yahoo.com login problems
It may be a virus problem.. try this.. go to run.. type "netsh int ip reset reset.txt" without quotes.. And restart your sys and then try.. surely it wont happen any more..
SOURCE: cant get yahoo login page to come up / it says
try update certificade. is a windows end life, try update windows
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