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Bug 1662189 - ssh is failing to export the display variable when configured vi /etc/sysctl.conf
Summary: ssh is failing to export the display variable when configured vi /etc/sysctl....
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: openssh
Version: 8.1
Hardware: All
OS: Linux
medium
medium
Target Milestone: rc
: 8.0
Assignee: Jakub Jelen
QA Contact: Ondrej Moriš
URL:
Whiteboard:
Depends On: 1489013
Blocks: 1594286 1679810
TreeView+ depends on / blocked
 
Reported: 2018-12-26 22:38 UTC by vinay
Modified: 2023-12-15 16:17 UTC (History)
4 users (show)

Fixed In Version: openssh-8.0p1-5.el8
Doc Type: Bug Fix
Doc Text:
Cause: Bug in X11 display binding when IPv6 is disabled. Consequence: The X11 forwarding was failing if IPv6 was disabled. Fix: The ssh no longer fails if the (IPv6) address is not available. Result: SSH is able to initialize X11 forwarding in networks where IPv6 is disabled.
Clone Of: 1489013
Environment:
Last Closed: 2020-11-04 01:31:59 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
OpenSSH Project 2143 0 None None None 2019-07-18 21:32:21 UTC
Red Hat Product Errata RHBA-2020:4439 0 None None None 2020-11-04 01:32:19 UTC

Comment 14 Ondrej Moriš 2020-04-02 10:42:45 UTC 
Successfully reproduced and verified.

OLD (openssh-8.0p1-4.el8_1)
===========================
$ ssh -X root.lab.eng.bos.redhat.com
X11 forwarding request failed on channel 0

# sysctl -a | grep disable_ipv6
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.ens3.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
net.ipv6.conf.virbr0.disable_ipv6 = 1
net.ipv6.conf.virbr0-nic.disable_ipv6 = 1

# echo $DISPLAY

# xterm 
Warning: This program is an suid-root program or is being run by the root user.
The full text of the error or warning message cannot be safely formatted
in this environment. You may get a more descriptive message by running the
program as a non-root user or by removing the suid bit on the executable.
xterm: Xt error: Can't open display: %s
xterm: DISPLAY is not set

# netstat --numeric-ports | grep localhost

NEW (openssh-8.0p1-5.el8)
=========================
$ ssh -X root.lab.eng.bos.redhat.com

# sysctl -a | grep disable_ipv6
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.ens3.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
net.ipv6.conf.virbr0.disable_ipv6 = 1
net.ipv6.conf.virbr0-nic.disable_ipv6 = 1

# echo $DISPLAY
localhost:10.0

# xterm 
xterm: cannot load font "-Misc-Fixed-medium-R-*-*-13-120-75-75-C-120-ISO10646-1"
xterm: cannot load font "-misc-fixed-medium-r-semicondensed--13-120-75-75-c-60-iso10646-1"
<running>

# netstat --numeric-ports | grep localhost
tcp        0      0 localhost:6010          localhost:35032         ESTABLISHED
tcp        0      0 localhost:35032         localhost:6010          ESTABLISHED
Comment 17 errata-xmlrpc 2020-11-04 01:31:59 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (openssh bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2020:4439
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