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Secure Connection Failure

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  • 1 has this problem
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  • Last reply by BPTao

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Hello. Since installing Thunderbird v91.5 on my new Windows 11 laptop, I get a Secure Connection Failure when trying to get add-ons. This doesn't happen with my other PC's running Windows 10. Anyone have a solution? -- Thanks!

Hello. Since installing Thunderbird v91.5 on my new Windows 11 laptop, I get a Secure Connection Failure when trying to get add-ons. This doesn't happen with my other PC's running Windows 10. Anyone have a solution? -- Thanks!

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Look at the anti virus on your new device. Many of them "hack" secure connections to scan the content before it gets to the application. The result of this is they use dodgy certificates to decrypt mail and Thunderbird does not see them as valid as they are not issued in the chain of trust. They are self signed by the anti virus company. I don't trust any of them.

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Much appreciated Matt, but I'm sure what to look for in the Virus and Threat Protection menu options. I'm using Windows Security (that came with Windows 11).

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I can not help you with windows 11. My new computer (3 months now) is not compatible apparently.

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No worries. Thanks anyway.

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