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[Bug 2112611] Re: ssh -X and ssh -Y does not work to non-ESM enabled servers iin 22.04

 

Jun 17 03:31:27 igloo sshd[2057390]: Accepted publickey for root from 50.251.249.49 port 52654 ssh2: RSA SHA256:a5bReJXl7L91eGOuCYugHsY2rn2a0WTDXEBTC93YdmA
Jun 17 03:31:27 igloo sshd[2057390]: pam_unix(sshd:session): session opened for user root(uid=0) by root(uid=0)
Jun 17 03:31:28 igloo sshd[2057390]: error: Failed to allocate internet-domain X11 display socket.
Jun 17 17:11:06 igloo sshd[2334525]: Accepted publickey for root from 50.251.249.49 port 44348 ssh2: RSA SHA256:a5bReJXl7L91eGOuCYugHsY2rn2a0WTDXEBTC93YdmA
Jun 17 17:11:06 igloo sshd[2334525]: pam_unix(sshd:session): session opened for user root(uid=0) by root(uid=0)
Jun 17 17:11:07 igloo sshd[2334525]: error: Failed to allocate internet-domain X11 display socket.
Jun 17 17:23:25 igloo sshd[2338704]: Accepted publickey for root from 50.251.249.49 port 37794 ssh2: RSA SHA256:a5bReJXl7L91eGOuCYugHsY2rn2a0WTDXEBTC93YdmA
Jun 17 17:23:25 igloo sshd[2338704]: pam_unix(sshd:session): session opened for user root(uid=0) by root(uid=0)
Jun 17 17:23:25 igloo sshd[2338704]: error: Failed to allocate internet-domain X11 display socket.

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https://bugs.launchpad.net/bugs/2112611

Title:
  ssh -X and ssh -Y does not work to non-ESM enabled servers iin 22.04

Status in openssh package in Ubuntu:
  Incomplete

Bug description:
  Until recently I have been able to ssh -X to my machines and run X applications such as synaptic remotely.
  Within the last two days this broke and I am not 100% sure if it is an issue with xauth or ssh but it will not start X forwarding, debugging just says it fails without much info.  However, it works on all ESM enabled machines.  These are all Ubuntu 24.04.  The only difference I can see is some of the libs that xauth uses appear to be different.  But I don't know the root cause, I just know it was working until recently and now it doesn't.

  ProblemType: Bug
  DistroRelease: Ubuntu 24.04
  Package: ssh (not installed)
  Uname: Linux 6.15.0 x86_64
  ApportVersion: 2.28.1-0ubuntu3.6
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: MATE
  Date: Thu Jun  5 20:46:47 2025
  SourcePackage: openssh
  UpgradeStatus: Upgraded to noble on 2024-10-05 (244 days ago)

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References