Re: Emacs Tramp hangs with timeout when connecting to server with two-factor authentication from a Windows 11 machine via sshx/scpx

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Alexei Srour <[email protected]> writes:

> Hello Michael,

Hi Alexei,

> Notably, enabling the option `tramp-debug-to-file` did not actually
> change anything? I attempted adjusting variables
> `tramp-compat-temporary-file-directory` and `temporary-file-directory
> ` but no result. Inspecting traces of various connections always had
> the `temp-file` pointing at=20
> `C:/Users/name/AppData/Local/Temp/tramp.xxxxxx`, but I was never able
> to find the file. I'll disregard the issue for the time being.

Good catch! The file shall have a name like
"c:/Users/albinus/AppData/Local/Temp/*debug tramp scpx albinus@gandalf*".

Apparently, on MS Windows it doesn't work if a file name has a leading
or trailing "*". I've fixed this in tramp-message (see appended patch);
will also be fixed in the upcoming Tramp 2.8.0.5.

> Inevitably, at some point today after hours of debugging and
> documenting, Tramp began cooperating and creating a debug buffer for
> my failed connections, no `temp-file` required.

Hmm, this looks strange:

=2D-8<---------------cut here---------------start------------->8---
> 14:36:32.794272 tramp-send-command (6) # ssh -l <user> -p <port> -e none=
 -t -t -o RemoteCommand=3D"/bin/sh  -i" -o SetEnv=3D"TERM=3Ddumb" <ip addr=
ess> && exit || exit
> 14:37:30.478478 tramp-accept-process-output (10) # #<process *tramp/scpx=
 <user>@<ip address>#<port>*> run nil
> ssh -l <user> -p <port> -e none -t -t -o RemoteCommand=3D"/bin/sh  -i" -=
o SetEnv=3D"TERM=3Ddumb" <ip address> && exit || exit
> 14:37:30.482824 tramp-process-actions (3) # Waiting for prompts from rem=
ote shell...failed
> 14:37:30.483496 tramp-maybe-open-connection (3) # Opening connection for=
 <user>@<ip address>#<port> using scpx...failed
=2D-8<---------------cut here---------------end--------------->8---

Tramp did wait for ~1 minute, but there's no output from ssh at
all. Hmm.

Which ssh client do you use? Call 'ssh -V'. IIRC, older ssh clients
ceased to work on MS Windows.

> Kind regards,
> Alexei

Best regards, Michael.


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diff --git a/lisp/tramp-message.el b/lisp/tramp-message.el
index aafceaf3..05598bb4 100644
=2D-- a/lisp/tramp-message.el
+++ b/lisp/tramp-message.el
@@ -197,9 +197,13 @@ They are completed by `M-x TAB' only in Tramp debug b=
uffers."
 (defun tramp-get-debug-file-name (vec)
   "Get the debug file name for VEC."
   (declare (tramp-suppress-trace t))
-  (expand-file-name
-   (string-replace "/" " " (tramp-debug-buffer-name vec))
-   tramp-compat-temporary-file-directory))
+  (let ((buffer-name (tramp-debug-buffer-name vec)))
+    (expand-file-name
+     (string-replace
+      "/" " "
+      (if (eq system-type 'windows-nt)
+	  (substring buffer-name 1 (1- (length buffer-name))) buffer-name))
+     tramp-compat-temporary-file-directory)))
=20
 (defun tramp-trace-buffer-name (vec)
   "A name for the trace buffer for VEC."

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