“The issue is a rather tricky one, and stems from the fact that Google will frequently now keep the HTTP connection open using keep-alives when indexing another host with the same shared IP address. When these two hosts happen to be different accounts then a bug in the component of the VPS software that handles requests to name based accounts handles these requests incorrectly.”

The only page on the Internets that can truly show you how to fix this particular problem.

WordPress-specific examples of the advice in Mark Pilgrim’s 410 error post.

All about that 410 error and how to use it.

(Almost) All you need to know.