Check the calendar/clock on your computer, to be sure that the date/time are correct. If your computer will not hold/keep the correct information, you may need to replace the "coin" battery on your motherboard (see your manufacturer or your computer manual for instructions and to determine whether you have a replaceable battery or if it is soldered to the motherboard). *http://kb.mozillazine.org/SSL_Security_Error *Set date time Windows XP: http://www.techyv.com/questions/date-and-time-setting-windows-xp You can view the certificate information by clicking the Site Identity Button (icon at the left end of the Location/URL bar; see below) when on the page, then click More Information, on the Page Info "Security" tab, click "View Certificate", then on the "General" tab, look at dates under "Validity". *https://www.mozilla.com/en-US/firefox/security/identity/ *https://support.mozilla.com/en-US/kb/Site+Identity+Button *http://www.dria.org/wordpress/archives/2008/05/06/635/ '''If this reply solves your problem, please click "Solved It" next to this reply when <u>signed-in</u> to the forum.''' ------------------------- Not related to your question, but... You may need to update some plug-ins. Check your plug-ins and update as necessary: *Plug-in check --> http://www.mozilla.org/en-US/plugincheck/ *Adobe Shockwave for Director Netscape plug-in: [https://support.mozilla.com/en-US/kb/Using%20the%20Shockwave%20plugin%20with%20Firefox#w_installing-shockwave Installing ('''''or Updating''''') the Shockwave plugin with Firefox] *'''''Adobe PDF Plug-In For Firefox and Netscape''''': [https://support.mozilla.com/en-US/kb/Using%20the%20Adobe%20Reader%20plugin%20with%20Firefox#w_installing-and-updating-adobe-reader Installing/Updating Adobe Reader in Firefox] *Shockwave Flash (Adobe Flash or Flash): [https://support.mozilla.com/en-US/kb/Managing%20the%20Flash%20plugin#w_updating-flash Updating Flash in Firefox] *'''''Next Generation Java Plug-in for Mozilla browsers''''': [https://support.mozilla.com/en-US/kb/Using%20the%20Java%20plugin%20with%20Firefox#w_installing-or-updating-java Installing or Updating Java in Firefox]