Invalid MIT-MAGIC-COOKIE-1 key

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After many, many successful ssh2 sessions over which I've been able to
run X programs, via SSH's forwarding mechanism, all of a sudden today
I got an error message:

    Xlib: connection to "localhost:10.0" refused by server
    Xlib: Invalid MIT-MAGIC-COOKIE-1 key

I know nothing about Xauthority or magic cookies or so forth.  

Any suggestions?

Many thanks.


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