Bug 65543

Summary:	X11 forwarding broken on IPv4 + IPv6 machines
Product:	[Retired] Red Hat Linux	Reporter:	Per Steinar Iversen <persteinar.iversen>
Component:	openssh	Assignee:	Tomas Mraz <tmraz>
Status:	CLOSED DUPLICATE	QA Contact:	Brian Brock <bbrock>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	7.3
Target Milestone:	---
Target Release:	---
Hardware:	i386
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2005-02-03 13:03:31 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Per Steinar Iversen 2002-05-27 10:28:28 UTC

Description of Problem:

X11 forwarding does not work on IPv4 + IPv6 machines. This because the X11
forwarder listen to ::1 while ssh tries to connect to 127.0.0.1 in order to
reach the forwarder.

There is a workaround, add this to /etc/ssh/sshd_config :

X11UseLocalhost no

After restarting X11 forwarding works as expected


Version-Release number of selected component (if applicable): openssh-3.1p1-3


How Reproducible: Always


Steps to Reproduce:

1. Login with ssh on a IPv4 + IPv6 machine, it does not matter if this is done
over IPv4 or IPv6.
2. Try to start any X11 application, for example xterm
3. The application fails to start

Actual Results:

X11 forwarding does not work.


Expected Results:

That X11 forwarding works.

Additional Information:

A workaround is available, but it would be better to fix the IPv4 loopback vs.
IPv6 loopback confusion.

Comment 1 Tomas Mraz 2005-02-03 13:03:31 UTC


*** This bug has been marked as a duplicate of 60982 ***