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Sure.

Thank you very much for the uber-fast response (and pointing out the problem right away).

Let me know if you need any further info (log txt copy or similar).

If the info is of any use:

WordPress LiteSpeed cache plugin uses the "host" (socket) and the port in its configuration (won't work without both configured), while XenForo seems to be using the "host" (socket) only.

Edit/update:

No. WP LiteSpeed disregards the port if you set it to zero (0).

And you must set it to zero if you are using a socket.