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

[Lucas Kanashiro]

This is confusing Robert, is your target system running Debian Bullseye?
There is no Debian release called Bullet. Do you have any custom
configuration in the server or client side? Please provide more
information, for instance detailed steps, so we can attempt to reproduce
it.

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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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