[Bug 1949535] Re: X-forwarding no longer works

Robert Dinse 1949535 at bugs.launchpad.net
Mon Nov 8 20:48:21 UTC 2021 

I am originating from a Ubuntu 21.10 system to a Debian Bullet system,
but now I can't get X-forwarding to work from any site I connect to when
originating from Ubuntu 21.10.

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On Mon, 8 Nov 2021, Paride Legovini wrote:

> Date: Mon, 08 Nov 2021 15:43:10 -0000
> From: Paride Legovini <1949535 at bugs.launchpad.net>
> To: nanook at eskimo.com
> Subject: [Bug 1949535] Re: X-forwarding no longer works
> 
> Hello Robert and thanks for your bug report. You wrote:
>
>> I recently upgraded my debian shell server to Bullet
>
> but I'm not sure I get what you mean. Is it a Debian system or an Ubuntu
> system? If it's upgrading a Debian system that broke your setup then
> there's nothing I can see that points to a bug in Ubuntu. Moreover: what
> is Bullet? Did you mean Bullseye or Bookworm?
>
> If you think there's actually a bug in Ubuntu here please share more of
> your reasoning, possibly providing a reproducer, e.g. by ssh -X to a
> container or VM. I'm marking this bug report as Incomplete for the
> moment. Feel free to change it back to New after commenting back.
> Thanks!
>
> ** Changed in: openssh (Ubuntu)
>       Status: New => Incomplete
>
> -- 
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1949535
>
> Title:
>  X-forwarding no longer works
>
> Status in openssh package in Ubuntu:
>  Incomplete
>
> Bug description:
>  I operate a Linux based Internet hosting service that includes Linux
>  shell servers of various flavors.  I control these from home using
>  Ubuntu 21.10 presently.  Until recently, X-forwarding has worked from
>  all but ancient Redhat 6.2 servers.  I recently upgraded my debian
>  shell server to Bullet, and after the upgrade ssh -X debian.eskimo.com
>  from my workstation nanook.eskimo.com ceased to function.  It simply
>  says "Cannot open DISPLAY".  At the time, all the others continued to
>  work.  Today, when I went to do upgrades, now ssh -X is forwarding
>  across the board to all flavors of Linux.  I did an ssh -V, nothing
>  obvious wrong in the connection.
>
>  debug1: Authentications that can continue: publickey,password
>  debug1: Next authentication method: publickey
>  debug1: Offering public key: /home/nanook/.ssh/id_rsa RSA SHA256:a5bReJXl7L91eGOuCYugHsY2rn2a0WTDXEBTC93YdmA agent
>  debug1: Server accepts key: /home/nanook/.ssh/id_rsa RSA SHA256:a5bReJXl7L91eGOuCYugHsY2rn2a0WTDXEBTC93YdmA agent
>  debug1: Authentication succeeded (publickey).
>  Authenticated to igloo.eskimo.com ([204.122.16.128]:22).
>  debug1: channel 0: new [client-session]
>  debug1: Requesting no-more-sessions at openssh.com
>  debug1: Entering interactive session.
>  debug1: pledge: network
>  debug1: client_input_global_request: rtype hostkeys-00 at openssh.com want_reply 0
>  debug1: Remote: /home/nanook/.ssh/authorized_keys:1: key options: agent-forwarding port-forwarding pty user-rc x11-forwarding
>  debug1: Remote: /home/nanook/.ssh/authorized_keys:1: key options: agent-forwarding port-forwarding pty user-rc x11-forwarding
>  debug1: Sending environment.
>  debug1: Sending env LANG = en_US.UTF-8
>  debug1: client_input_channel_req: channel 0 rtype exit-status reply 0
>  debug1: client_input_channel_req: channel 0 rtype eow at openssh.com reply 0
>  debug1: channel 0: free: client-session, nchannels 1
>  debug1: fd 2 clearing O_NONBLOCK
>  Connection to igloo.eskimo.com closed.
>  Transferred: sent 3748, received 3820 bytes, in 6.4 seconds
>  Bytes per second: sent 589.4, received 600.8
>
>  I don't see anything obviously wrong here but still it does not work, I get:
>  xclock
>  Error: Can't open display:
>
>  ProblemType: Bug
>  DistroRelease: Ubuntu 21.10
>  Package: ssh (not installed)
>  Uname: Linux 5.13.19 x86_64
>  ApportVersion: 2.20.11-0ubuntu71
>  Architecture: amd64
>  CasperMD5CheckResult: unknown
>  CurrentDesktop: MATE
>  Date: Tue Nov  2 17:31:14 2021
>  SourcePackage: openssh
>  UpgradeStatus: No upgrade log present (probably fresh install)
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/1949535/+subscriptions
>

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to openssh in Ubuntu.
https://bugs.launchpad.net/bugs/1949535

Title:
  X-forwarding no longer works

Status in openssh package in Ubuntu:
  Incomplete

Bug description:
  I operate a Linux based Internet hosting service that includes Linux
  shell servers of various flavors.  I control these from home using
  Ubuntu 21.10 presently.  Until recently, X-forwarding has worked from
  all but ancient Redhat 6.2 servers.  I recently upgraded my debian
  shell server to Bullet, and after the upgrade ssh -X debian.eskimo.com
  from my workstation nanook.eskimo.com ceased to function.  It simply
  says "Cannot open DISPLAY".  At the time, all the others continued to
  work.  Today, when I went to do upgrades, now ssh -X is forwarding
  across the board to all flavors of Linux.  I did an ssh -V, nothing
  obvious wrong in the connection.

  debug1: Authentications that can continue: publickey,password
  debug1: Next authentication method: publickey
  debug1: Offering public key: /home/nanook/.ssh/id_rsa RSA SHA256:a5bReJXl7L91eGOuCYugHsY2rn2a0WTDXEBTC93YdmA agent
  debug1: Server accepts key: /home/nanook/.ssh/id_rsa RSA SHA256:a5bReJXl7L91eGOuCYugHsY2rn2a0WTDXEBTC93YdmA agent
  debug1: Authentication succeeded (publickey).
  Authenticated to igloo.eskimo.com ([204.122.16.128]:22).
  debug1: channel 0: new [client-session]
  debug1: Requesting no-more-sessions at openssh.com
  debug1: Entering interactive session.
  debug1: pledge: network
  debug1: client_input_global_request: rtype hostkeys-00 at openssh.com want_reply 0
  debug1: Remote: /home/nanook/.ssh/authorized_keys:1: key options: agent-forwarding port-forwarding pty user-rc x11-forwarding
  debug1: Remote: /home/nanook/.ssh/authorized_keys:1: key options: agent-forwarding port-forwarding pty user-rc x11-forwarding
  debug1: Sending environment.
  debug1: Sending env LANG = en_US.UTF-8
  debug1: client_input_channel_req: channel 0 rtype exit-status reply 0
  debug1: client_input_channel_req: channel 0 rtype eow at openssh.com reply 0
  debug1: channel 0: free: client-session, nchannels 1
  debug1: fd 2 clearing O_NONBLOCK
  Connection to igloo.eskimo.com closed.
  Transferred: sent 3748, received 3820 bytes, in 6.4 seconds
  Bytes per second: sent 589.4, received 600.8

  I don't see anything obviously wrong here but still it does not work, I get:
  xclock
  Error: Can't open display:

  ProblemType: Bug
  DistroRelease: Ubuntu 21.10
  Package: ssh (not installed)
  Uname: Linux 5.13.19 x86_64
  ApportVersion: 2.20.11-0ubuntu71
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: MATE
  Date: Tue Nov  2 17:31:14 2021
  SourcePackage: openssh
  UpgradeStatus: No upgrade log present (probably fresh install)

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