My rental Linux server doesn't respond to nmap the way I thought it would. When I run nmap it shows three open ports: 80, 443 and 8080. However, I know ports 2083, 22 and 2222 should all be open, as they're used for the web-based C-Panel, SSH and SFTP, respectively.
Has my server rental company not opened these ports fully, or is does nmap not give a complete list (by default)?
By default, nmap scans the thousand most common ports. Ports 2083 and 2222 aren't on that list. In order to perform a complete scan, you need to specify "all ports" (nmap -p 1-65535, or the shortcut form nmap -p-).
Port 22, on the other hand, is on the list. If nmap isn't reporting it, it's because something's blocking your access, or the SSH server isn't running.
These are the 1000 ports that nmap randomly checks if not said otherwise. You can see that 2222 is on the list, but 2083 isn't.
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