Para checar quais portas estão abertas no servidor CentOs 7:
# nmap -v endereço_ip_servidor
Para o cloud.mkt.tools
# nmap -v 192.168.0.1
Starting Nmap 6.40 ( http://nmap.org ) at 2021-03-29 15:54 -03
Initiating Parallel DNS resolution of 1 host. at 15:54
Completed Parallel DNS resolution of 1 host. at 15:54, 0.00s elapsed
Initiating SYN Stealth Scan at 15:54
Scanning e3.d1.36a9.ip4.static.sl-reverse.com (169.54.209.227) [1000 ports]
Discovered open port 110/tcp on 169.54.209.227
Discovered open port 53/tcp on 169.54.209.227
Discovered open port 22/tcp on 169.54.209.227
Discovered open port 143/tcp on 169.54.209.227
Discovered open port 21/tcp on 169.54.209.227
Discovered open port 587/tcp on 169.54.209.227
Discovered open port 993/tcp on 169.54.209.227
Discovered open port 80/tcp on 169.54.209.227
Discovered open port 995/tcp on 169.54.209.227
Discovered open port 443/tcp on 169.54.209.227
Discovered open port 25/tcp on 169.54.209.227
Discovered open port 3306/tcp on 169.54.209.227
Discovered open port 465/tcp on 169.54.209.227
Completed SYN Stealth Scan at 15:54, 1.59s elapsed (1000 total ports)
Nmap scan report for e3.d1.36a9.ip4.static.sl-reverse.com (169.54.209.227)
Host is up (0.000021s latency).
Not shown: 987 closed ports
PORT STATE SERVICE
21/tcp open ftp
22/tcp open ssh
25/tcp open smtp
53/tcp open domain
80/tcp open http
110/tcp open pop3
143/tcp open imap
443/tcp open https
465/tcp open smtps
587/tcp open submission
993/tcp open imaps
995/tcp open pop3s
3306/tcp open mysql
Read data files from: /usr/bin/../share/nmap
Nmap done: 1 IP address (1 host up) scanned in 1.64 seconds
Raw packets sent: 1062 (46.728KB) | Rcvd: 2137 (89.780KB)