Author Topic: Firefox Error code: SEC_ERROR_UNKNOWN_ISSUER  (Read 1319 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 »
W8.1 [x64] - Avast Free AV 23.3.8047.BC [UI.757] - Firefox ESR 102.9 [NS/uBO/PB] - Thunderbird 102.9.1
Avast-Tools: Secure Browser 109.0 - Cleanup 23.1 - SecureLine 5.18 - DriverUpdater 23.1 - CCleaner 6.01
Avast Wissenswertes (Downloads, Anleitungen & Infos): https://forum.avast.com/index.php?topic=60523.0