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  •  bluegroper
      bluegroper
[SOLVED] X11 forwarding request failed on channel 0
#1
Regular Board Member
Joined: 2005/9/7
From .au
Posts: 114
Hi forum

I have a freshly installed CentOS 5.7 server packages only.
No GUI, cli only.
When logging in from console, all works as expected.

But when using remote ssh login, I keeps getting the error message.
X11 forwarding request failed on channel 0

Seems to cause no bother, just a tad untidy and annoying.
Already tried setting the following in /etc/ssh/sshd_config but it seems no help or not relevant.
X11Forwarding no

TIA's for any tips or clues to tidy this up.
Posted on: 2012/1/3 11:40
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  •  pschaff
      pschaff
Re: X11 forwarding request failed on channel 0
#2
Moderator
Joined: 2006/12/13
From Tidewater, Virginia, North America
Posts: 18773
What does the following show?
grep X11 /etc/ssh/*_config
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Phil

Recommended reading: FAQ & Readme first ; Search hint: google "your topic site:centos.org"; Smart Questions
Posted on: 2012/1/3 11:52
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  •  bluegroper
      bluegroper
Re: X11 forwarding request failed on channel 0
#3
Regular Board Member
Joined: 2005/9/7
From .au
Posts: 114
# grep X11 /etc/ssh/*_config

/etc/ssh/ssh_config:#   ForwardX11 no
/etc/ssh/ssh_config:# If this option is set to yes then remote X11 clients will have full access
/etc/ssh/ssh_config:# to the original X11 display. As virtually no X11 client supports the untrusted
/etc/ssh/ssh_config:    ForwardX11Trusted yes
/etc/ssh/sshd_config:X11Forwarding no
/etc/ssh/sshd_config:#X11Forwarding yes
/etc/ssh/sshd_config:#X11DisplayOffset 10
/etc/ssh/sshd_config:#X11UseLocalhost yes
Posted on: 2012/1/3 21:39
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  •  pschaff
      pschaff
Re: X11 forwarding request failed on channel 0
#4
Moderator
Joined: 2006/12/13
From Tidewater, Virginia, North America
Posts: 18773
Quote:

bluegroper wrote:
/etc/ssh/ssh_config: ForwardX11Trusted yes

I'd set that to "no" and do the same for other X11 parameters that show a default of "yes" in the comments.
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Phil

Recommended reading: FAQ & Readme first ; Search hint: google "your topic site:centos.org"; Smart Questions
Posted on: 2012/1/4 2:50
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  •  bluegroper
      bluegroper
Re: X11 forwarding request failed on channel 0
#5
Regular Board Member
Joined: 2005/9/7
From .au
Posts: 114
Quote:

pschaff wrote:

I'd set that to "no" and do the same for other X11 parameters that show a default of "yes" in the comments.


Tried that too, then service sshd restart, but remote login still throws the irritant error.

Any more suggestions ?
Posted on: 2012/1/4 9:37
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  •  TrevorH
      TrevorH
Re: X11 forwarding request failed on channel 0
#6
Moderator
Joined: 2009/9/24
From Brighton, UK
Posts: 6317
What client are you using on the remote end?
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Posted on: 2012/1/4 9:40
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  •  bluegroper
      bluegroper
Re: X11 forwarding request failed on channel 0
#7
Regular Board Member
Joined: 2005/9/7
From .au
Posts: 114
Quote:

TrevorH wrote:
What client are you using on the remote end?


PCLinuxOS, with OpenSSH_5.9p2, OpenSSL 1.0.0e 6 Sep 2011
Posted on: 2012/1/4 9:46
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  •  bluegroper
      bluegroper
Re: X11 forwarding request failed on channel 0 [SOLVED]
#8
Regular Board Member
Joined: 2005/9/7
From .au
Posts: 114
Bingo.

The problem was caused by ssh client (PCLOS), NOT the sshd server (CentOS).
Thx for clues.

Edit. How do I change the topic heading of OP to [SOLVED] ?
Posted on: 2012/1/5 0:22
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  •  AlanBartlett
      AlanBartlett
Re: [SOLVED] X11 forwarding request failed on channel 0
#9
Moderator
Joined: 2007/10/22
From ~/Earth/UK/England/Suffolk
Posts: 9132
Thank you for reporting back with the solution.

Quote:

Edit. How do I change the topic heading of OP to [SOLVED] ?

An ordinary user does not have that ability.

We recommend exactly what you have done -- add [SOLVED] or [RESOLVED], as appropriate, to your most recent posting. In due course a moderator will notice and make the edit, on your behalf, to the opening post's subject line.
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Alan

100% Unix & Linux. Co-founder of the ELRepo Project.
Posted on: 2012/1/5 3:02
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  •  pschaff
      pschaff
Re: [SOLVED] X11 forwarding request failed on channel 0
#10
Moderator
Joined: 2006/12/13
From Tidewater, Virginia, North America
Posts: 18773
Exactly as you have done. Just reply with [SOLVED] (or [RESOLVED] if more appropriate) in the subject, as explained in Readme First, and a moderator should come along and mark the head of the thread on your behalf. The current brain-damaged forum software does not allow a user to do so.

Edit: I see Alan beat me by seconds.
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Phil

Recommended reading: FAQ & Readme first ; Search hint: google "your topic site:centos.org"; Smart Questions
Posted on: 2012/1/5 3:03
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