bug#19404: 25.0.50; Gnus shows self-signed certificate warning when connecting to Gmane

[Eli Zaretskii]

> From: Lars Magne Ingebrigtsen <larsi@gnus.org>
> Cc: dgutov@yandex.ru,  19404@debbugs.gnu.org
> Date: Thu, 18 Dec 2014 17:06:10 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> Nope.  It's a self-signed certificate.  Press "A" to accept.
> >
> > Really?  How can you tell it's self-signed?
> 
> Because I installed it myself.  :-)

OK, let me rephrase: How can a user, a mere mortal, like myself or
Dmitry, tell that this certificate is OK, while the one I was
presented in my problem is not?