Port 25 opened, why?

[mpzfm1]

How is this posible? nmap tells me port 25 its open but firewalld is not configured to have it opened....

[stevemowbray]

What is your nmap command? Are you scanning localhost?

[silvio]

You check that from localhost or from an external system?

Silvio

[mpzfm1]

sorry, its nmap localhost

[TrevorH]

There is no point in nmapping localhost. No-one except you can get to it.

[mpzfm1]

thanks, but, why it says that is opened???? cant i use nmap to my localhost in order to know which ports are opened to outside????

[TrevorH]

No. Scanning localhost will show you things that are only listening on localhost and are no danger at all. Likewise, it will also show you things that are listening on localhost as well as the external interface but won't tell you if there are firewall rules that restrict access thus making the port safe. It's pointless. If you want to know what's open externally, scan from outside against the external interface ip.