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"X11 forwarding request failed on channel 3" [solved]

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  • "X11 forwarding request failed on channel 3" [solved]

    I tried some searches with bing and google for an answer, but both failed.

    This is a thread specific to this error and a solution.

    Code:
    user@source.example.com $ ssh -X user@target.example.com
    X11 forwarding request failed on channel 3
    user@target.example.com $
    Turns out "xauth" package was missing on the target server target.example.com .

    How this was found? Debug in ssh:
    Code:
    user@source.example.com $ ssh -v -X user@target.example.com
    .
    .
    .
    .
    debug1: Requesting X11 forwarding with authentication spoofing.
    debug1: Remote: No xauth program; cannot forward with spoofing.
    X11 forwarding request failed on channel 3
    user@target.example.com $
    Add the xauth package, problem solved. (This thread is for search engines.)

    I doubt many other people will encounter this problem.
    Other channel failure errors can be found with the help of search engines.
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