Looks like imap.gmail.com should be the one.

Paul.

On Sat, 14 Dec 2024 at 15:05, Max Nikulin <maniku...@gmail.com> wrote:

> On 14/12/2024 14:09, Dima wrote:
> > Using VPN via SOCK5
> >
> > Got a message notification pop-up "Certificate for imap.google.com does
> > not come from the trusted source." with a button "activate".
>
> Likely imap.googlemail.com
>
> For HTTP, providers sometimes use "captive portal" to request user
> authentication or to show some notification. For TLS it causes an error.
> I have no idea if some party (VPN provider? Proxy authentication?
> Incorrect VPN configuration?) may use it for IMAP.
>
> In some cases server does not send an intermediate certificate in
> signing chain (browser on administrator's computer acquired it from
> other site, so they are unaware of the issue), but I would not expect it
> from Google.
>
> A tool to debug issues is "openssl s_client"
>
> > - View a log. May be there is a log in Thunderbird or in systemd, and I
> > can identify that issue, found certificate that blamed.
>
> Thunderbird has console [Ctrl+Shift+J], but usually logs (and their
> persistence) should be enabled in advance.
>
> Maybe certificate management is better documented for Firefox.
>
>

-- 


*Paul Duncan*

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SCHMIDT OCEAN INSTITUTE

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