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
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