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Can't add an exception to "Untrusted Connection Error", have deleted "cert8.db", no help.

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I get the "Untrusted Error" on a known safe site. When I try to add an exception and make the exception permanent, nothing happens. I deleted cert8.db with no results. I used to access this site with no problem.

Running ESR 24.5.0 Portable

Thanks Ed

I get the "Untrusted Error" on a known safe site. When I try to add an exception and make the exception permanent, nothing happens. I deleted cert8.db with no results. I used to access this site with no problem. Running ESR 24.5.0 Portable Thanks Ed

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Is that the only site with an issue?

Could you expand the Technical Details section of the certificate error page and paste the error code into a reply?

Also, I guess it goes without saying that Firefox 24.5 is more than 7 months behind on security updates, so you should consider using a more up-to-date version of Firefox. The last in that series was 24.8.1 (ESR) from September.