Public bug reported:
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-sessi...@openssh.com
debug1: Entering interactive session.
debug1: pledge: network
debug1: client_input_global_request: rtype hostkeys...@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 e...@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)
** Affects: openssh (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug impish
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https://bugs.launchpad.net/bugs/1949535
Title:
X-forwarding no longer works
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