The cloaca or vent is the last passage through which the egg travels out of the body. It is also the passage for fecal matter at the end of the digestive tract to be expelled outside the body of the hen.
Hens might have invented enshittification before marketing did. Literally.
In your case: no need for a fw if you can trust your local network.
Generally: services can have bugs - reverse proxy them. Not everybody needs to access the service - limit access with a firewall. Limit brute-force/ word-list attempts - MFA / fail2ban.
Green hematomas. Nature is always good for a surprise.
I knew of green, blue, purple and transparent blood in animals (OK, I knew blue blood in octopi and googled the rest. :). But green bruises was news to me.
https://livingurbanhomestead.com/how-does-a-chicken-lay-eggs/
Hens might have invented enshittification before marketing did. Literally.