Port 80 still blocked even after port forwarding and disabling firewall

Question

I have been trying to open port 80 for my Apache server. However, the port is still closed, even after port forwarding it on my router and disabling every firewall. I have checked the port before and after starting Apache, and something does start listening, however the port is still closed. Could another app be closing it? Does anybody have any insight to what might be causing this?

Answer 1

For anybody having the same problem, the issue was that my ISP was by default blocking Port 80, so I had to change the settings on my router and redo the port forwarding.

ISPs can block certain ports for various reasons such as security, so always check on their website beforehand.