Why are ports not being scanned?

Question

linux

I enter nmap hostname.zone for my host
. As a result, it displays ports for me, BUT: port 210 with IRC and port 3306 with mysql does not show.
Then I set nmap -sT hostname.zone -p210 and it writes that it is open. So why doesn't it show in the first case?

Answer 1

1. I would like to see the output from root: nmap -sS hostname.zone
2. By default, nmap scans the privileged port range 0-1024

Answer 2

I guess:
Scanning comes from the outside, that is, from the side of the global network.
The mirka port is NOT transferred from the router to your computer (or wherever you have a server with mirka). The MySQL port is NOT forwarded through the router.
And the -sT switch scans from the LAN side - where, of course, the ports are open.