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I had difficulties using emacs from a Debian box, via a FreeBSD-based X server. After a short while, it would die with the following error:
X protocol error: BadWindow (invalid Window parameter) on protocol request 38
This turned out to be because ForwardX11Trusted is turned off, by default, in OpenSSH 3.8 and later. This causes problems with X clients (such as emacs) which need full access to the X server.
To fix, either invoke ssh on the client with the
-Y option, or set ForwardX11Trusted in the
/etc/ssh/ssh_config or /~/.ssh/config files:
ForwardX11Trusted yes
This is documented in the OpenSSH FAQ, which no longer exists on the OpenSSH.com site.
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