Thunderbird message - the certificate 127.0.0.1 does not come from trusted source
Trying to use Thunderbird after break of some years and want to use Proton Mail. Every time I try to set it up I get message 'the certificate 127.0.0.1does not come from trusted source'. Previous experience of Thunderbird was that there were frequent issues like this arising.
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Hi,
If you are using Proton Bridge, you are running a web server with a self-signed certificate on your own machine (i.e. localhost/127.0.0.1). In this case, you have to import this certificate into Thunderbird's own trust store.
Luckily Proton has its own guide for this: https://proton.me/support/protonmail-bridge-clients-windows-thunderbird/
Regards, Balázs
I have been using Thunderbird on my Linux laptop (Zorin Pro) for about 8 months connected to my proton eMail account via Proton Mail Bridge (and I use Proton VPN as well). After I clicked to install some system updates from the software updater installed on my laptop I was required to do a restart. After the restart, I brought up my VPN, then connected my Proton Mail Bridge, then Thunderbird. Then I received this error message where my certificate is not coming from a trusted source. The reply from the original report (from Balazs Mesko) points to the Proton instructions which explain how to initially install.. I tried to use these and of course, get an error - Incoming server already exists.
So I am still dead in the water.
I finally solved the problem. After the message box that says: The certificate 127.0.0.1 does not come from trusted source, Thunderbird displays another message, like the image attached.
It is important NOT to click the button to [Get Certificate]. Instead, just click the button on the bottom left:
First, check the box: [__] Permanently store this exception Then, click the button: [Confirm Security Exception]
This worked for me. Good luck. Regards, Bob M.
