Re: Raspbian: After update from buster to bookworm, X11Forwarding in ssh connection stopped working

["B.M." <b-misc@gmx.ch>]

On Montag, 7. August 2023 15:19:49 CEST you wrote:
> Dear all,
>
> I just dist-upgraded my Raspberry Pi from buster to bookworm, and while
>
> ssh -Y...
>
> worked like a charm in before the update and I could start any X11 program
> over ssh, it doesn't work anymore since then. Executing
>
> ssh -Y -C -l myUser otherHostname.local -v
>
> I get
>
> ...
> debug1: Requesting X11 forwarding with authentication spoofing.
> debug1: Sending environment.
> debug1: channel 0: setting env LANG = "en_US.UTF-8"
> debug1: channel 0: setting env LC_MONETARY = "de_CH.UTF-8"
> debug1: channel 0: setting env LC_MEASUREMENT = "de_CH.UTF-8"
> debug1: channel 0: setting env LC_TIME = "de_CH.UTF-8"
> debug1: channel 0: setting env LC_ALL = ""
> debug1: channel 0: setting env LC_COLLATE = "C"
> debug1: channel 0: setting env LC_NUMERIC = "de_CH.UTF-8"
> X11 forwarding request failed on channel 0
> ...
>
> From /etc/ssh/sshd_config on the server:
>
> AddressFamily inet
> X11Forwarding yes
> X11UseLocalhost no
>
> Interestingly, when connecting for the first time I got a warning:
> WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!
> and I did just
> ssh-keygen -f "/home/xxx/.ssh/known_hosts" -R "otherHostname"
> which I did.
>
> xauth is installed on the server.
>
> What can be the reason, that I cannot use X11 forwarding anymore?
>
> Thank you.
>
> Best,
> Bernd

Sorry, correction: I didn't upgrade from buster to bookworm but from bullseye.