Author Topic: Firefox Error code: SEC_ERROR_UNKNOWN_ISSUER  (Read 431 times)

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Offline allanh93

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Firefox Error code: SEC_ERROR_UNKNOWN_ISSUER
« on: April 18, 2020, 04:07:15 AM »
Hi there,

I have just uninstalled Avast today and now I cannot browse many websites on Firefox with the following error:

Did Not Connect: Potential Security Issue
Error code: SEC_ERROR_UNKNOWN_ISSUER

I'm guessing that some of Avast's protections were not uninstalled properly? Could someone please help me fix this issue? I have already tried uninstall and reinstall Firefox.

Thanks

Offline Asyn

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Re: Firefox Error code: SEC_ERROR_UNKNOWN_ISSUER
« Reply #1 on: April 18, 2020, 06:18:54 AM »
Win8.1 [x64] - Avast PremSec 21.1.2443.B#1 [UI.595] - EEK - Firefox ESR 78.6.1 [NS/uBO/PB] - TB 78.6.1
Avast-Tools: Secure Browser 87.1 - Cleanup P 20.1 - SecureLine 5.9 - Driver Updater 20.2 - CCleaner 5.75
Avast Wissenswertes (Downloads, Anleitungen & Infos): https://forum.avast.com/index.php?topic=60523.0