There was a somewhat recent security update that fixed the logic of the
DisableForwarding option:
https://launchpad.net/ubuntu/+source/openssh/1:9.6p1-3ubuntu13.11
I wonder if you have that option configured, and it just recently
started to take effect.
Can you please share the output of:
$ apt policy openssh-server
$ sshd -G | grep forward
from one of the affected servers?
** Changed in: openssh (Ubuntu)
Status: New => Incomplete
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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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