ICMP Protocol is not using either TCP or UDP
as far as I understand doesn't use the concept of ports.

So I blocked outgoing packets on port 433 i.e going to an HTTPS server:

(sudo) iptables -I OUTPUT -p tcp --dport 443 -j DROP

now, if I ping any HTTPS server I hoped traffic would pass through
but it didn't.

why is this so?

Does the ping request somehow adopt the port open (443) of the HTTPS server?

CodePudding user response：

No, ICMP is a network layer protocol and has no concept of ports.

Assuming that you can make requests to the web server and receive responses, and without knowing the network topology / network configurations, the most probable cause is that some other network device along the path is filtering ICMP packets.

CodePudding user response：

My bad. There's No Problem Whatsoever