Do you have any script sending this: Snap! One more 404 on Website

Hello,

We did some PHP update on the server and I keep getting an error 404 message by email.

I was wondering if there's any plugin from WPMU sending that notification.

Thank you (see below)

Snap! One more 404 on Website
Bummer! You have one more 404

IP Address 182.68.123.167
404 Path /wp-admin/admin-ajax.php
User Agent Mozilla/5.0 (Windows NT 6.2; WOW64; rv:41.0) Gecko/20100101 Firefox/41.0