X2Go Bug report logs - #151
Limit tunneled (localhost -> localhost) traffic to IPv4

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Package: x2goclient; Maintainer for x2goclient is X2Go Developers <x2go-dev@lists.x2go.org>; Source for x2goclient is src:x2goclient.

Reported by: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>

Date: Thu, 28 Mar 2013 08:33:02 UTC

Severity: normal

Tags: pending

Fixed in version

Done: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>

Bug is archived. No further changes may be made.

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From: owner@bugs.x2go.org (X2Go Bug Tracking System)
Subject: Bug#151 closed by Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
 (X2Go issue (in src:x2goclient) has been marked as closed)
Message-ID: <handler.151.c.137889407616971.notifdone@bugs.x2go.org>
References: <20130911100707.962315DB2C@ymir>
X-X2go-PR-Keywords: pending
X-X2go-PR-Message: they-closed 151
X-X2go-PR-Package: x2goclient
X-X2go-PR-Source: x2goclient
Date: Wed, 11 Sep 2013 10:18:14 +0000
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[Message part 1 (text/plain, inline)]
This is an automatic notification regarding your Bug report
which was filed against the x2goclient package:

#151: Limit tunneled (localhost -> localhost) traffic to IPv4

It has been closed by Mike Gabriel <mike.gabriel@das-netzwerkteam.de>.

Their explanation is attached below along with your original report.
If this explanation is unsatisfactory and you have not received a
better one in a separate message then please contact Mike Gabriel <mike.gabriel@das-netzwerkteam.de> by
replying to this email.

X2Go Bug Tracking System
Contact owner@bugs.x2go.org with problems
[Message part 2 (message/rfc822, inline)]
From: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
To: 151-submitter@bugs.x2go.org
Cc: control@bugs.x2go.org, 151@bugs.x2go.org
Subject: X2Go issue (in src:x2goclient) has been marked as closed
Date: Wed, 11 Sep 2013 12:07:07 +0200 (CEST)
close #151


we are very hopeful that X2Go issue #151 reported by you
has been resolved in the new release ( of the
X2Go source project »src:x2goclient«.

You can view the complete changelog entry of src:x2goclient (
below, and you can use the following link to view all the code changes
between this and the last release of src:x2goclient.


If you feel that the issue has not been resolved satisfyingly, feel
free to reopen this bug report or submit a follow-up report with
further observations described based on the new released version
of src:x2goclient.

Thanks a lot for contributing to X2Go!!!

X2Go Git Admin (on behalf of the sender of this mail)

X2Go Component: src:x2goclient
Date: Wed, 11 Sep 2013 12:06:02 +0200
Fixes: 141 142 151 164 165 177 179 183 214 222 226 243 255
 x2goclient ( RELEASED; urgency=low
   [ Nicolai Hansen ]
   * New upstream version (
     - Update Danish translation file.
   [ Terje Andersen ]
   * New upstream version (
     - Update Norwegian Bokmaal translation file.
   [ Oleksandr Shneyder ]
   * New upstream version (
     - Use "" instead of localhost to avoid wrong IPv6 hostname
       resolution. (Fixes: #151).
     - Wait for x2gocmdexitmessage to return before closing in hidden mode.
     - Support for published applications in X2Go Plugin
     - Support for "shadow" mode in X2Go Plugin
   [ Mike Gabriel ]
   * New upstream version (
     - If a priv SSH key has been specified, skip the autologin procedure.
       Let's consider a given SSH private key that fails to log the user
       in as an overall login failure. (Fixes: #141).
     - Avoid multiple selectUserSession requests when in broker
     - Properly set the remote server address received via selectUserSession
       method when in broker mode. (Fixes: #226).
     - Fix segmentation fault that started occurring since the custom trayIcon
       patch was applied. Segfault only occurred if the tray icon was not used.
     - Show session name in notification bubbles.
     - Update German translation.
     - Add cmdline option --broker-autologoff: Enforce re-authentication against
       X2Go Session Broker after a session has been suspended or terminated.
       (Fixes: #179).
     - Enable full access desktop sharing across user accounts. (Fixes: #222).
     - Make X2Go Client aware of the MATE desktop environment.
     - Make X2Go Client work in SSH broker mode without the need of a auth-id
   [ Heinrich Schuchardt ]
   * New upstream version (
     - Call ssh_clean_pubkey_hash() for deallocating public key hashes instead of
       just calling free(). Required under MS Windows as documented in libssh2
       API. (Fixes: #243). (For further details see:
   * Provide bin:package with debug symbols for X2Go Client. (Fixes: #255).
   [ Ezra BĂĽhler ]
   * New upstream version (
     - Fix auto-resume when session type is »Single Application«. (Fixes: #183).
   [ Ricardo DĂ­az MartĂ­n ]
   * New upstream version (
     - Fix detection of maximum screen area available for a session. (Fixes:
     - Use the session icon as tray icon, pop up notification bubble that informs
       about current session actions. (Fixes: #177).
     - Allow for setting maximum available desktop size as window size via the
       session profile card. Unfortunately, this feature is for now only
       available on Linux. (Fixes: #214).
   [ Otto Kjell ]
   * New upstream version (
     - Enable debug mode through cmd line parameter. (Fixes: #142).
     - Standardize output to stdout+stderr and make it parseable.
   [ Orion Poplawski ]
   * New upstream version (
     - Instead of using a hard-code DPI of 96, use local DPI settings for new
       sessions if not explicitly set in session profile (Fixes: #164).
   [ Daniel Lindgren ]
   * New upstream version (
     - Update Swedish translation file.
   [ Ricardo DĂ­az MartĂ­n ]
   * New upstream version (
     - Update Spanish translation file.

[Message part 3 (message/rfc822, inline)]
From: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
To: submit@bugs.x2go.org
Subject: Limit tunneled (localhost -> localhost) traffic to IPv4
Date: Thu, 28 Mar 2013 09:27:46 +0100
[Message part 4 (text/plain, inline)]
Package: x2goclient
Severity: grave
Tag: ipv6

Hi Alex,

Orion reported this issue on IRC:

To work around it, I guess, we should limit the tunnel connections in  
X2Go to IPv4 (as they are localhost to localhost connections anyway).

Here is the IRC backlog of the reported issue:

18:51 < orionp> Is there a known issue with x2client and ssh proxy  
connections with passwords?  I'm getting "connection refused".
18:56 < neverpanic> you mean your ssh host is password-protected? No,  
that works.
18:56 < neverpanic> at least for me
18:57 < neverpanic> connection refused doesn't sound like an  
authentication issue anyway
18:57 < orionp> It seems to be a ssh hanshake issue
18:57 < orionp> handshake
18:57 < orionp> It seems like this used to work for me, but now it doesn't
18:58 < orionp> Even with ssh-agent it fails now, though with a  
different error.
19:47 < orionp> Hmm, looks like a race condition - tries to connect to  
the ssh tunnel port before it is bound



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