Gnus hang, when sending mail from gmail account with gnutls.

[filebat Mark]

Hi gnusers

I can receive mails of gmail by imap. However, after struggling for several days, I still fail to send mail in gnus.
Would you please help to root cause the problem? My environment: cygwin + ntemacs 23.

Below is my gnus related configuration, and ~/.authinfo is correct.

And it hangs with the output of "220 2.0.0 Ready to start TLS", when I try to invoke message-send in *Message* mode.
No problem is found, when manually invoke "gnutls-cli-debug.exe www.google.com".

It seems hang at smtpmail.el::smtpmail-via-smtp
line 672        (if (or (null (car (setq greeting (smtpmail-read-response process))))

;; -------------------------- *trace of SMTP session to smtp.gmail.com --------------------------
220 mx.google.com ESMTP v13sm4048733wfv.17

EHLO CNRDZHANGD1L1C

250-mx.google.com at your service, [222.70.51.13]

250-SIZE 35651584

250-8BITMIME

250-STARTTLS

250 ENHANCEDSTATUSCODES

STARTTLS

220 2.0.0 Ready to start TLS

QUIT

;; -------------------------- gnus configuration --------------------------
(require 'gnus)
(setq user-full-name "filebat")
(setq user-mail-address "filebat.mark@gmail.com")
(setq gnus-select-method
      '(nnimap "gmail"
               (nnimap-address "imap.gmail.com")
               (nnimap-server-port 993)
               (nnimap-stream ssl))
      )
(setq gnus-startup-file "~/.newsrc"
      gnus-default-directory "~/Mail/"
      gnus-home-directory "~/Mail/"
      gnus-article-save-directory "~/Mail/save/"
      gnus-kill-files-directory "~/Mail/trash/"
      gnus-agent-directory "~/Mail/agent/"
      gnus-cache-directory "~/Mail/cache/"
      mail-source-directory "~/Mail/incoming/"
      nnmail-message-id-cache-file "~/Mail/.nnmail-cache"
      nnml-newsgroups-file "~/Mail/newsgroup"
      message-directory "~/Mail/"
      message-auto-save-directory "~/Mail/drafts/")

(setq gnus-save-newsrc-file nil
      gnus-read-newsrc-file nil
      gnus-use-dribble-file nil
      gnus-save-killed-list nil)

(setq gnus-interactive-exit nil) ;; No confirmation when exiting Gnus.

(setq starttls-use-gnutls t)
(setq send-mail-function 'smtpmail-send-it
      message-send-mail-function 'smtpmail-send-it
      smtpmail-starttls-credentials '(("smtp.gmail.com" 587 nil nil))
      smtpmail-auth-credentials
      (expand-file-name "~/.authinfo")
      smtpmail-default-smtp-server "smtp.gmail.com"
      smtpmail-smtp-server "smtp.gmail.com"
      smtpmail-smtp-service 587
      smtpmail-debug-info t)
(require 'smtpmail)
;; -------------------------- gnutls-cli-debug.exe --------------------------
$ gnutls-cli-debug.exe www.google.com
Resolving 'www.google.com'...
Connecting to '66.249.89.104:443'...
Checking for TLS 1.1 support... no
Checking fallback from TLS 1.1 to... TLS 1.0
Checking for TLS 1.0 support... yes
Checking for SSL 3.0 support... yes
Checking for HTTPS server name... not checked
Checking for version rollback bug in RSA PMS... no
Checking for version rollback bug in Client Hello... no
Checking whether we need to disable TLS 1.0... N/A
Checking whether the server ignores the RSA PMS version... no
Checking whether the server can accept Hello Extensions... yes
Checking whether the server can accept cipher suites not in SSL 3.0 spec... yes
Checking whether the server can accept a bogus TLS record version in the client hello... n
o
Checking for certificate information... N/A
Checking for trusted CAs... N/A
Checking whether the server understands TLS closure alerts... partially
Checking whether the server supports session resumption... yes
Checking for export-grade ciphersuite support... no
Checking RSA-export ciphersuite info... N/A
Checking for anonymous authentication support... no
Checking anonymous Diffie-Hellman group info... N/A
Checking for ephemeral Diffie-Hellman support... no
Checking ephemeral Diffie-Hellman group info... N/A
Checking for AES cipher support (TLS extension)... yes
Checking for 3DES cipher support... yes
Checking for ARCFOUR 128 cipher support... yes
Checking for ARCFOUR 40 cipher support... no
Checking for MD5 MAC support... yes
Checking for SHA1 MAC support... yes
Checking for LZO compression support (GnuTLS extension)... no
Checking for max record size (TLS extension)... no
Checking for SRP authentication support (TLS extension)... yes
Checking for OpenPGP authentication support (TLS extension)... no


-- 
Thanks & Regards

Denny Zhang