Us.data.toolbar.yahoo.com.443 A problem of an invalid security certificate.
This could be a problem with the server's configuration or it could be someone trying to impersonate the server.
If you have connected to this server successfully in the past the error may be temporary and you can try again later.
The main reason why error occur is your date and time. Did you checked your System Date/Time settings. Have you recently Installed or Uninstalled any application Or your CMOS battery may need a Replacement. CMOS is responsible for B.I.O.S.(Basic Input Output System) setting so the battery will make sure that your CMOS settings will kept the System Date and Time Update.
* Open control Panel or type "control" without quotes in run command double click date and time properties then update your date and time.
* Or type "timedate.cpl" in run command without quotes and hit enter.
* set the Correct Date and Time and apply restart your browser.
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