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Opening connection using telnet ... failed

From: SENESI Stéphane
Subject: Opening connection using telnet ... failed
Date: Thu, 26 Feb 2015 04:15:44 +0100 (CET)

Hi everybody

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
03:58:59.764916 tramp-get-file-property (8) #  file-truename nil
03:58:59.765207 tramp-flush-directory-property (8) #
03:58:59.765493 tramp-get-connection-property (7) # process-name nil
03:58:59.765824 tramp-flush-connection-property (7) # [telnet my_account my_host nil nil] nil
03:58:59.766182 tramp-get-connection-property (7) # process-buffer nil
03:58:59.766572 tramp-file-name-handler (1) # Interrupt received in operation (expand-file-name /telnet:address@hidden:~ nil)

How can I further dig into this issue ?

Thanks for any help


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