Windows 10 bereikte EO (einde ondersteuning) op 14 oktober 2025. Als je Windows 10 gebruikt, lees dan dit artikel.

Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

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Error code: sec_error_reused_issuer_and_serial

skermani

When i trying to go to https://mail.google.com/ or to yahoo mail in my windows 7, firefox reports Secure Connection Failed (Error code: sec_error_reused_issuer_and_serial), But when i using freegate proxy i have no problem. I set my firefox proxy setting on : use system proxy setting. Also i have no problem when using firefox in my kubuntu linux. Other browser in my system (IE) have no problem with ssl website.

When i trying to go to https://mail.google.com/ or to yahoo mail in my windows 7, firefox reports Secure Connection Failed (Error code: sec_error_reused_issuer_and_serial), But when i using freegate proxy i have no problem. I set my firefox proxy setting on : use system proxy setting. Also i have no problem when using firefox in my kubuntu linux. Other browser in my system (IE) have no problem with ssl website.

Bewerkt door skermani op

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Gekozen oplossing

ok, other eset users have reported the same issue - can you please try the solution given here: https://support.mozilla.org/de/questions/790114#answer-339989

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hello, which security software are you using - does it have an option to scan ssl traffic? if so please try disabling this function once and see if firefox can establish an encrypted connection to gmail successfully afterwards.

Thanks, I am using Eset smart security, When I disable its protection and firewall the problem is not resolved and firefox reports the error too.

Bewerkt door skermani op

Gekozen oplossing

ok, other eset users have reported the same issue - can you please try the solution given here: https://support.mozilla.org/de/questions/790114#answer-339989

Thanks for the tip. I followed the advice and it worked well.

I use linux and I haven't eset or any anti virus but I have this problem too.