Strange X11 Forwarding Problem

I started getting this error:
X11 connection rejected because of wrong authentication
when trying to forward X11 applications from a Linux server to my Mac. I had been forwarding the display on this server for years, so I was a little unsure what could be causing it. In the end, it turned out that I had filled up /var, and X11 could not write to “/var/log/XFree86.0.log”. It was an easy fix, but the error was certainly no help.

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