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FireFox - Access Denied

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I have been accessing Navy Federal for a year on Firefox on my MacBook Air. Today, when trying to access my Navy Federal Account, the computer message is: "Access Denied. You don't have permission to access http://signon.navyfederal.org/siteminderagent/forms/nfcu.fcc’ on this server. Reference #18.4e457b68.1612501415.2a77b49d."

So far, I have closed and re-opened Firefox, rebooted the MacBook Air, and deleted and reinstalled Firefox. I still get the same message.

OBTW, if I walk 10 feet to my wife’s MacBook Pro and try accessing my Navy Federal account using her Firefox, I get right in to the account.

I have been accessing Navy Federal for a year on Firefox on my MacBook Air. Today, when trying to access my Navy Federal Account, the computer message is: "Access Denied. You don't have permission to access http://signon.navyfederal.org/siteminderagent/forms/nfcu.fcc’ on this server. Reference #18.4e457b68.1612501415.2a77b49d." So far, I have closed and re-opened Firefox, rebooted the MacBook Air, and deleted and reinstalled Firefox. I still get the same message. OBTW, if I walk 10 feet to my wife’s MacBook Pro and try accessing my Navy Federal account using her Firefox, I get right in to the account.

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There is security software like Avast, Kaspersky, BitDefender and ESET that intercept secure connection certificates and send their own.

https://support.mozilla.org/en-US/kb/firefox-cant-load-websites-other-browsers-can

https://support.mozilla.org/en-US/kb/firefox-and-other-browsers-cant-load-websites

https://support.mozilla.org/en-US/kb/secure-connection-failed-error-message

https://support.mozilla.org/en-US/kb/connection-untrusted-error-message

Websites don't load - troubleshoot and fix error messages

http://kb.mozillazine.org/Error_loading_websites

What do the security warning codes mean