21 port is enabled on my server but when I run the command:
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[root@server1 ~]# nmap -p 21,22,80,443 x.x.x.x
Starting Nmap 6.40 ( http://nmap.org ) at 2020-03-22 12:22 +0530
Nmap scan report for server1.xxxxxxxxxx.com (x.x.x.x)
Host is up (0.000079s latency).
PORT STATE SERVICE
21/tcp closed ftp
22/tcp open ssh
80/tcp open http
443/tcp open https
Nmap done: 1 IP address (1 host up) scanned in 0.07 seconds
[root@server1 ~]#Regards,
Khalequzzaman