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After ssh'ing to a machine (with -X) I run qemu and get the following:

X Error of failed request:  BadWindow (invalid Window parameter)
  Major opcode of failed request:  25 (X_SendEvent)
  Resource id in failed request:  0x37d
  Serial number of failed request:  14
  Current serial number in output stream:  17

But I can run xclock or gedit without a problem. (So other programs work fine through X11 forwarding.)

How do I get QEMU to run without this error?

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I found the answer here: http://www.pantz.org/software/ssh/badwindowerrorwithqemu.html.

Use the -Y option with ssh instead of -X, to enable trusted X11 forwarding.

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