Hi Guys,
I've been having a problem for several days, and I've made a series of changes to my Opnsense installation to resolve it. I disabled Suricata, Zenarmor, created some crazy firewall rules, allowing all types of traffic to and from Meta's ASNs and nothing solved the problem: no Facebook or WhatsApp sites would open.
I searched here on the Forum and looked for some solutions on the Internet, without success. Until today, I decided to use Bing. And the chat responded with the culprit: Syncookies.
I can't tell if this is a bug in Opnsense, Meta, or if it's an expected situation. The fact is that I believe that this problem (yes, it exists) is poorly documented. I don't know what the best place for this would be, and I leave it to the Admins to decide.
Greetings,
L.
Have you even tried to use the forum search with the word "syncookies"? The first thing to come up is one post about how to disable syncookies for Facebook sites.