Renew certificate failed due to secondary validation (again)

[Bruce5051]

@smon

This is not my server problem or firewall problem. It was confirmed by Letsencrypt staff.

But the last post Renew certificate failed due to secondary validation - #32 by mcpherrinm

@mcpherrinm

The problem doesn't appear to have been anything on our end, so there's not much more for us to investigate.