I have a question regarding network firewalls and TCP traffic. When a firewall rule is set to block either inbound traffic, outbound traffic, or both on a port, does that only apply to initial communication requests?
Just as an example, if I have a computer that has outbound port 80 blocked, but inbound port 80 opened, does that mean this computer can serve web pages, but cannot request any? Or does it mean that whenever a client connects, establishes a TCP session, and sends the HTTP request, the server is not allowed to send anything back?
Please let me know if this question is hard to understand. If so, I will try to clarify.