bug#16784: 24.3; Problems opening NNTP connection: failing starttls because of a non-verified certificate

[sb]

Entering news.gmane.no nntp groups in gnus fails on Windows, because it
tries to upgrade the connection using STARTTLS and fails because the
news.gmane.org certificate is self signed.

I did
 (setq gnutls-log-level 1)
in the scratch buffer, and tried entering a group, and saw the following
in the messages buffer:
Opening nntp server on news.gmane.org...done
gnutls.c: [0] (Emacs) fatal error: The TLS connection was non-properly 
terminated.
gnutls.c: [1] (Emacs) allocating credentials
gnutls.c: [1] (Emacs) gnutls callbacks
gnutls.c: [1] (Emacs) gnutls_init
gnutls.c: [1] (Emacs) got non-default priority string: NORMAL
gnutls.c: [1] (Emacs) setting the priority string
news.gmane.org certificate could not be verified.
gnutls.c: [1] (Emacs) certificate signer was not found: news.gmane.org
gnutls.c: [1] (Emacs) certificate validation failed: news.gmane.org
gnutls.c: [0] (Emacs) fatal error: The TLS connection was non-properly 
terminated.
apply: Server closed connection

I'm using the following GNU-TLS:
 gnutls-3.0.9-w32-bin.zip (from 
http://sourceforge.net/projects/ezwinports/files/)
(unzipped, and the dlls dropped into the emacs-24.3/bin/ directory)



In GNU Emacs 24.3.1 (i386-mingw-nt6.2.9200)
 of 2013-03-17 on MARVIN
Windowing system distributor `Microsoft Corp.', version 6.2.9200
Configured using:
 `configure --with-gcc (4.7) --cflags
 -ID:/devel/emacs/libs/libXpm-3.5.8/include
 -ID:/devel/emacs/libs/libXpm-3.5.8/src
 -ID:/devel/emacs/libs/libpng-dev_1.4.3-1/include
 -ID:/devel/emacs/libs/zlib-dev_1.2.5-2/include
 -ID:/devel/emacs/libs/giflib-4.1.4-1/include
 -ID:/devel/emacs/libs/jpeg-6b-4/include
 -ID:/devel/emacs/libs/tiff-3.8.2-1/include
 -ID:/devel/emacs/libs/gnutls-3.0.9/include
 -ID:/devel/emacs/libs/libiconv-1.13.1-1-dev/include
 -ID:/devel/emacs/libs/libxml2-2.7.8/include/libxml2'

Important settings:
  value of $LANG: NOR
  locale-coding-system: cp1252
  default enable-multibyte-characters: t

Major mode: Article

Minor modes in effect:
  diff-auto-refine-mode: t
  display-time-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
e l l SPC m e SPC t o SPC t r y SPC a g a i n s t SPC 
t h e SPC g n u s SPC d e l i v e r e d SPC w i t h 
SPC C-p C-a M-f C-k C-k C-k . SPC <return> <return> 
I S-SPC t h i n k SPC I S-SPC w i l l SPC j s u t SPC 
<backspace> <backspace> <backspace> <backspace> u s 
t SPC r e p o r t t <backspace> SPC t h e SPC b u g 
SPC o n SPC <backspace> SPC m y SPC s y s t e m SPC 
a s SPC i t SPC i s . M-x g n u s <backspace> <backspace> 
<backspace> <backspace> e m a c s - r e p <tab> C-g 
M-v M-x r e p o r t - e m a c s - b u g <return> C-x 
o <up> <up> <up> <up> <up> <up> <up> <up> <up> <up> 
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up> 
<up> <up> <up> <up> <up> <up> <up> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up> 
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up> 
<up> <up> <up> C-x b C-x o C-x b <return> <up> <up> 
<up> <down> SPC C-x o C-n C-n C-n C-n C-n C-n C-n C-n 
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> C-SPC C-e M-w M-x 
<up> <return>

Recent messages:
Mark set [3 times]
Auto-saving...done
Auto-saving...done
Mark set
byte-code: End of buffer
Mark set [3 times]
browse-url-at-point: No URL found
Auto-saving...done
Quit
byte-code: Command attempted to use minibuffer while in minibuffer

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c:/Users/sb/git/gnus/lisp/canlock hides 
c:/ProgramFiles/emacs-24.3/lisp/gnus/canlock
c:/Users/sb/git/gnus/lisp/auth-source hides 
c:/ProgramFiles/emacs-24.3/lisp/gnus/auth-source
c:/Users/sb/git/gnus/lisp/.dir-locals hides 
c:/ProgramFiles/emacs-24.3/lisp/gnus/.dir-locals
c:/Users/sb/git/gnus/lisp/time-date hides 
c:/ProgramFiles/emacs-24.3/lisp/calendar/time-date
c:/Users/sb/git/gnus/lisp/parse-time hides 
c:/ProgramFiles/emacs-24.3/lisp/calendar/parse-time
c:/Users/sb/apps/share/emacs/site-lisp/icalendar hides 
c:/ProgramFiles/emacs-24.3/lisp/calendar/icalendar

Features:
(shadow emacsbug shr-color color shr browse-url gnus-dup org-clock
org-w3m org-wl org-vm org-rmail org-mhe org-mew org-irc org-habit
org-jsinfo org-infojs org-html org-exp ob-exp org-exp-blocks org-agenda
org-info org-gnus org-docview org-bibtex bibtex org-bbdb org-install org
ob-tangle ob-ref ob-lob ob-table org-footnote org-src ob-comint ob-keys
org-pcomplete pcomplete org-list org-faces org-entities noutline outline
org-version ob-emacs-lisp ob org-compat org-macs ob-eval org-loaddefs
find-func nnagent magit-key-mode magit view help-mode grep compile
comint epa derived epg diff-mode autorevert git-rebase-mode thingatpt
git-commit-mode server log-edit ring pcvs-util add-log dired url-http
url-gw url-cache url-auth time-stamp vc-git pp canlock bbdb-message
sendmail flow-fill mm-archive sort gnus-cite ansi-color mail-extr u-appt
appt diary-lib diary-loaddefs cal-menu calendar cal-loaddefs gnus-bcklg
gnus-async qp gnus-ml spam-gmane dns mm-url edmacro kmacro gnus-topic
nnml nndraft nnmh utf-7 rfc2104 gnutls bbdb-gnus bbdb-mua network-stream
warnings starttls gnus-agent gnus-srvr gnus-score score-mode nnvirtual
gnus-cache gnus-demon nntp gnus-diary nndiary spam-report spam spam-stat
bbdb-com crm bbdb bbdb-site timezone gnus-uu yenc gnus-msg gnus-art
mm-uu mml2015 epg-config mm-view mml-smime smime dig supercite regi
gnus-sync json advice advice-preload gnus-load bbdb-autoloads
magit-autoloads info git-rebase-mode-autoloads git-commit-mode-autoloads
finder-inf package cl-macs gv desktop cl cl-lib nnir gnus-sum gnus-group
gnus-undo gnus-start gnus-cloud nnimap nnmail mail-source tls utf7 netrc
parse-time gnus-spec gnus-int gnus-range message format-spec rfc822 mml
easymenu mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231
rfc2047 rfc2045 ietf-drums mailabbrev gmm-utils mailheader gnus-win gnus
gnus-ems gnus-compat url url-proxy url-privacy url-expand url-methods
url-history url-cookie url-domsuf url-util url-parse auth-source eieio
byte-opt bytecomp byte-compile cconv password-cache url-vars mailcap
wid-edit nnoo nnheader gnus-util mm-util help-fns mail-prsvr mail-utils
gnus-setup nxml-psgml-compatibility easy-mmode filladapt time jka-compr
time-date tooltip ediff-hook vc-hooks lisp-float-type mwheel dos-w32
ls-lisp w32-common-fns disp-table w32-win w32-vars tool-bar dnd fontset
image regexp-opt fringe tabulated-list newcomment lisp-mode register
page menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock
font-lock syntax facemenu font-core frame cham georgian utf-8-lang
misc-lang vietnamese tibetan thai tai-viet lao korean japanese hebrew
greek romanian slovak czech european ethiopic indian cyrillic chinese
case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer loaddefs
button faces cus-face macroexp files text-properties overlay sha1 md5
base64 format env code-pages mule custom widget hashtable-print-readable
backquote make-network-process w32 multi-tty emacs)