Hello, I am running SSL deep packet inspection (proxying users SSL queries) via my firewall.
I have noticed that some websites fail until I make an exception for them. I understand this is normally due to public key pinning (HPKP).
However I have run numerous tests on these websites and they do not seem to be using public key pinning.
What other reasons could there be for Deep Packet Inpsection failing on some HTTPS websites ?
Thank you.
