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After my Centos 6 server was powered down without a clean shutdown, I can't connect to the FreeNX service. I get errors like:

xrdb: No such file or directory
xrdb: Can't open display ':1001'

How can I fix this?

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Turns out that the /tmp/.X2-lock file had to be deleted. The following command might help anyone else in the future:

sudo rm /tmp/.X*-lock
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