So I setup a new IPS, and my Nest Cam immediately stopped working. Checking the logs found something interesting.

Snort IPS signatures firing on self-signed certificates

Then I checked one of the domains using my favorite SSL cert checker tool, SSL Shopper:

SHA-1 hashing, and self-signed to 2049

Clearly, self-signed SHA-1 certs are a receipe for disaster. Its apparent that anyone could view a camera’s video feed, without the camera’s owner even knowing.