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Re: Opening connection using telnet ... failed

From: Michael Albinus
Subject: Re: Opening connection using telnet ... failed
Date: Sun, 01 Mar 2015 18:45:07 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux)

SENESI Stéphane <address@hidden> writes:

> Hi everybody

Hi Stéphane

> I use Tramp for login from home to two computers at work, using VPN
> and telnet. This used to work fine for both. One of them underwent a
> system upgrade (to Mageia 4), and, possibly from that time, I cannot
> connect anymore. On the other computer, which runs another Unix
> flavor, everything is OK. On the same VPN connection, I can connect
> manually to the host showing the issue. The login prompt on that
> machine seems fine ("my host login:"). After login, I get some colored
> output (and so, some escape sequences), but this used to be the case
> also 'before', when the connection was working fine; and I think that
> the issue occurs upstream of that :
> Despite I set tramp-verbose to 20, I have no interesting hint in the
> debug buffer :
> ;; GNU Emacs: 23.3.1 Tramp: 2.2.11 -*- mode: outline; -*-
> 03:58:45.375022 tramp-get-connection-property (7) # ~ undef
> 03:58:45.375472 tramp-get-connection-property (7) # process-name nil
> 03:58:45.375775 tramp-get-connection-property (7) # process-name nil
> 03:58:45.376050 tramp-get-connection-property (7) # process-buffer nil
> 03:58:45.378153 tramp-maybe-open-connection (3) # Opening connection
> for address@hidden using telnet...
> 03:58:59.760183 tramp-dissect-file-name (3) # Opening connection for
> address@hidden using telnet...failed

Nothing happened for 14 seconds.

> 03:58:59.766572 tramp-file-name-handler (1) # Interrupt received in
> operation (expand-file-name /telnet:address@hidden:~ nil)

Looks like you have entered C-g in order to see what happens.

> How can I further dig into this issue ?

Hmm. Maybe you wait until Tramp runs into a time-out? I cannot promise
it works then, but sometimes telnet takes its time.

When the time-out occurs, it might be also interesting to see the
contents of the connection buffer (plus the Tramp debug buffer, as you
did already).

> Thanks for any help
> Stéphane

Best regards, Michael.

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