How are you trying to access the file? What type of file?

It's a pdf file sent from my printer to my documents file. It has worked fine for years through multiple Firefox upgrades and different printers and computers. Today also the computer(Firefox) stopped allowing me to go to Comcast.net and AOL saying they can't be trusted and won't allow exceptions. I have AVG and Kaspersky for protection.

How are you trying to move the file? -------- There is security software like Avast and Kaspersky and BitDefender and ESET that intercept secure connections and send their own certificate. http://www.ehow.com/how_11385212_troubleshoot-reset-connection-firefox.html https://support.mozilla.org/en-US/kb/server-not-found-connection-problem https://support.mozilla.org/en-US/kb/firefox-cant-load-websites-other-browsers-can https://support.mozilla.org/en-US/kb/secure-connection-failed-error-message https://support.mozilla.org/en-US/kb/connection-untrusted-error-message '''http://kb.mozillazine.org/Error_loading_websites''' '''This Connection is Untrusted''' is sometimes caused because the computer system clock is wrong. Check the time / date / time zone settings.