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Access Denied

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I have a quick question, why can I open and log on to one website but another web site I can open but logon attempt results in Access Denied. I can open the both websites with Edge & IE, any help is greatly appreciated.

I have a quick question, why can I open and log on to one website but another web site I can open but logon attempt results in Access Denied. I can open the both websites with Edge & IE, any help is greatly appreciated.
Attached screenshots

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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

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This problem I'm having is with one of my financial institutions, I can bring the website up, navigate inside website but when I logon to my account I receive the access denied message. I have no problem accessing & logging on to my other accounts. I can access this account using Edge, IE and Chrome but I prefer to use Firefox.

r/ Jerry