X2Go Bug report logs - #896
Session Resume Fails with "Failed to restore all the required visuals."

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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: Michael DePaulo <mikedep333@gmail.com>

Date: Fri, 26 Jun 2015 13:00:02 UTC

Severity: normal

Tags: pending

Merged with 696, 891

Found in versions,

Fixed in version

Done: X2Go Release Manager <git-admin@x2go.org>

Bug is archived. No further changes may be made.

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From: owner@bugs.x2go.org (X2Go Bug Tracking System)
Subject: Bug#896 closed by X2Go Release Manager <git-admin@x2go.org> (X2Go
 issue (in src:x2goclient) has been marked as closed)
Message-ID: <handler.896.c.14380518148637.notifdone@bugs.x2go.org>
References: <20150728025004.D8EFE5DA87@ymir.das-netzwerkteam.de>
X-X2go-PR-Keywords: pending
X-X2go-PR-Message: they-closed 896
X-X2go-PR-Package: x2goclient
X-X2go-PR-Source: x2goclient
Date: Tue, 28 Jul 2015 02:55:10 +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:

#896: Session Resume Fails with "Failed to restore all the required visuals."

It has been closed by X2Go Release Manager <git-admin@x2go.org>.

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 X2Go Release Manager <git-admin@x2go.org> by
replying to this email.

X2Go Bug Tracking System
Contact owner@bugs.x2go.org with problems
[Message part 2 (message/rfc822, inline)]
From: X2Go Release Manager <git-admin@x2go.org>
To: 696-submitter@bugs.x2go.org
Cc: control@bugs.x2go.org, 696@bugs.x2go.org
Subject: X2Go issue (in src:x2goclient) has been marked as closed
Date: Tue, 28 Jul 2015 04:50:04 +0200 (CEST)
close #696


we are very hopeful that X2Go issue #696 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: Tue, 28 Jul 2015 04:48:20 +0200
Fixes: 696 882 901 909 911
 x2goclient ( RELEASED; urgency=low
   [ Mihai Moldovan ]
   * New upstream release (
     - INSTALL: add more verbose instructions on how to build X2Go Client and
     - onmainwindow.{cpp,h}: rename slotScDaemonOut() and slotScDaemonError()
       to slotScDaemonStdOut() and slotScDaemonStdErr(). I will need
       slotScDaemonError() later and the previous names were a bit of a
     - x2goutils.{cpp,h}: add new show_RichText_Generic_MsgBox() main function
       designed to replace the show_RichText_WarningMsgBox() function.
     - x2goutils.{cpp,h}: make show_RichText_WarningMsgBox() use
       show_RichText_Generic_MsgBox ().
     - x2goutils.{cpp,h}: new show_RichText_ErrorMsgBox() function as a wrapper
       for show_RichText_Generic_MsgBox() with a critical icon.
     - onmainwindow.{cpp,h}: properly handle scdaemon errors with a message box
       and close the client.
     - onmainwindow.cpp: manipulate PATH and append /usr/lib/gnupg2/ to it when
       starting scdaemon. Fixes: #882.
     - x2goutils.h: add QMessageBox include, fixed compile error.
     - onmainwindow.cpp: fix typos leading to compile errors.
     - onmainwindow.cpp: add blocks to switch cases to fix a compile error.
       Also correctly append to informative_text on one occasion, instead of
       overwriting it.
     - x2goutils.cpp: correct typo to fix compile errors.
     - onmainwindow.cpp: drop a redundant variable and fix empty env check.
     - onmainwindow.cpp: add more newlines to scdaemon error output. Use
       trayQuit() method to really quit the client.
     - onmainwindow.cpp: add debugging output for new scdaemon PATH value.
     - onmainwindow.cpp: split up PATH value as printed in the error message
       box by a newline every 100 characters. Makes it look less ugly and fixes
       truncation issues.
     - sshprocess.cpp: export PATH variable when running commands. Otherwise,
       only the first one will respect the new PATH value.
     - sshprocess.cpp: wrap SSH command prelude and conclusion in double
     - sshprocess.cpp: wrap all remote commands with "bash" instead of the
       unspecific "sh".
     - onmainwindow.cpp: try to escape shell quotes correctly when using
       Kerberos/GSSApi when running the xmodmap keyboard sync command on OS X.
     - onmainwindow.cpp: also escape other shell quotes when using
     - onmainwindow.cpp: silence compiler warning by casting an int value to
     - onmainwindow.cpp: silence another compiler warning by not converting
       from string to int and back to string needlessly. Just use the string.
       No need for an OS X-specific variable anymore.
     - onmainwindow.cpp: fix compile error - use QString.toAscii () to get a
       valid C string representation for tr ().
     - onmainwindow.cpp: don't terminate if scdaemon exited with non-zero exit
     - sshprocess.cpp: don't use QProcess::start (QString). Qt is trying to be
       too smart and causes big trouble. Instead, use QProcess::start (QString,
       QStringList) and pass the arguments as a list. On Windows, Qt will
       automatically double quote the arguments and duplicate escaped double
       quotes or escape non-escaped double quotes. On UNIX-like platforms, each
       element of the list is passed as a unique argv element, so there's no
       need for quoting them (that's only a shell-internal thing to group
     - sshprocess.cpp: add a bit more debugging - also print out the unmodified
       raw output of SSH commands.
     - onmainwindow.cpp: remove now-bogus double quote escaping.
     - sshmasterconnection.cpp: port QProcess::start () change.
     - sshprocess.cpp: whitespace/prettify only and a compile fix.
     - x2goclient.pro: reinstate old lrelease "search" behavior if
       qtPrepareTool() is not available. This should only happen on EPEL 6,
       which ships a broken Qt4 version...
     - onmainwindow.cpp: only set multidisplay mode for non-rootless sessions.
     - {ui/xsettingsui.ui,xsettingswidget.cpp}: add new "whole display" option
       for external X server configuration. Part of #883.
     - onmainwindow.cpp: rename "optionsmd" setting to "optionswholedisplay",
       which is more clear.
     - xsettingswidget.cpp: fix compile error: settings -> setting.
     - sessionmanagedialog.cpp: enable some debugging and make selected
       sessions configureable or deletable. Fixes: #909.
   [ Mike Gabriel ]
   * debian/control:
     + Add alternative D for nxproxy: qvd-nxproxy. Allows parallel installation
       of X2Go Client and the TheQVD client (perl-qvd-client).
   [ Mike DePaulo ]
     - Windows: Update bundled Win32 OpenSSL from 1.0.1m to 1.0.1p,
       which fixes the multiple CVEs announced on 2015-06-11 and
       CVE-2015-1793 (announced on 2015-07-09).
     - Windows: Upgrade the MSVC 2008 DLLs (9.0.21022.8) to the
       MSVC 2013 DLLs (12.0.21005.1), which Win32 OpenSSL now requires.
     - Windows: Only bundle msvcr120.dll; The other 2 MSVC DLLs aren't
       needed by Win32 OpenSSL.
     - Windows: Update bundled Cygwin OpenSSL from 1.0.2a-1 to 1.0.2d-1, which
       which fixes the multiple CVEs announced on 2015-06-11 and
       CVE-2015-1793 (announced on 2015-07-09).
     - Windows: Update bundled VcXsrv from (X2Go/Arctica Build)
       to (X2Go/Arctica Build)
       The differences relevant to X2Go are:
         + VcXsrv's bundled version of openssl was updated from 1.0.2a
           to 1.0.2d (fixes the multiple CVEs announced on 2015-06-11 and
           CVE-2015-1793 (announced on 2015-07-09).
         + Drop winmultiwindow.patch (Part of #883)
         + hw/xwin/glx: Don't create fbConfigs for un-accelerated
           This has the effect of disabling StaticColor under
           MultiWindow mode with -wgl (default) and -swrastwgl, and
           thus making X2Go sessions started from the Windows client
           able to be resumed on the client on a different OS or the
           client runing on Windows with different display settings.
           (Fixes: #696)
     - Linux: Fix desktop session icons (.desktop files) failing due to
       missing space between "x2goclient" and its 1st argument
       (e.g. "--session") (Fixes: #911)
   [ Henning Heinold ]
   * New upstream release (
     - x2goclient.pro: simplify lrelease path preparing for different OS and
       cross compiling. Fixes: #901.
   [ Oleksandr Shneyder ]
   * New upstream release (
     - onmainwindow.{cpp,h}: fix multimonitor mode on Windows. Run VcXsrv on
       selected screen without decorations.

[Message part 3 (message/rfc822, inline)]
From: Michael DePaulo <mikedep333@gmail.com>
To: "submit@bugs.x2go.org" <submit@bugs.x2go.org>
Subject: Session Resume Fails with "Failed to restore all the required visuals."
Date: Fri, 26 Jun 2015 08:55:14 -0400
Package: x2goclient
Severity: normal
Tags: +build-win32

Sometimes when starting an X2Go session on a Windows client, and
resuming it on a different machine (which may or may not be Windows),
the session fails to resume and you get this error message:

X2Go - 50
Failed to restore all the required visuals.
Can't resume the NX session on this display.

Screenshot: http://imgur.com/zQz69Cz

On test configuration #1 at least, I am still able to resume the
session on the original client, even after receiving the error on the
new client.

I have seen this issue occasionally over the last year or 2. I recall
experiencing it when try resume a session over RDP. However, I have 2
other test configurations listed below.

Note that the error message comes from nx-libs, not x2goclient.
x2goclient passes the error message to the user.

However, I am filing this bug under x2goclient since it is likely
possible to fix it by launching VcXsrv on Windows with different
options. In fact, at X2Go Gathering 2015, one of the QVD developers
said that they experienced this issue with QVD client for iOS, and
fixed it by launching their client-side X server with certain options:

Right now I am able to reproduce it with this test configuration (#1):

Server OS: Fedora 21 64-bit with latest updates
x2goserver: (from Fedora)
x2goserver-xsession: (from Fedora)

session-starting client OS: Windows 10 64-bit build 10130
session-starting x2goclient:
session-starting hardware: physical, accessed locally

session-resuming client OS: Windows XP 32-bit SP3 with last available updates
session-resuming x2goclient:
session-resuming hardware: Virtual. Running on the server's qemu-kvm
hypervisor with virt-manager. QXL & SPICE are used (the SPICE server
is built into the hypervisor.) Driver is "Red Hat QXL GPU" 7/17/2013 Color is set to 32-bit. Accessed over virt-viewer 2.0
from Windows.

Also, at the X2Go Gathering 2015, we were able to reproduce this with
the following 2 clients (but with a different server) (test config

Server Details: unknown

session-starting client OS: Windows 7 64-bit SP1 with latest updated
session-starting x2goclient:
session-starting hardware: physical, accessed locally

session-resuming client OS: X2Go TCE (version unknown) (based on
Debian 7 Wheezy IIRC)
session-resuming x2goclient: version unknown
session-resuming hardware: physical, accessed locally

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