Just received this on a site where Wordfence was working fine yesterday:
Your access to this service has been temporarily limited. Please try again in a few minutes. (HTTP response code 503)
Reason: Fake Google crawler automatically blocked
Important note for site admins: If you are the administrator of this website note that your access has been limited because you broke one of the Wordfence firewall rules. The reason you access was limited is: "Fake Google crawler automatically blocked".
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My client updated to a VPS from shared hosting today, can that cause this?