How to check whether port 25 is open or not from ssh access to server

Question

I have ssh access to my Linux server and I want to check whether port 25 open or not.

I discussed with hosting service provide and they said port 25 is open.

I checked using PHP script for port 25 and it says it is open.

I want to know how to check using command on linux server like in Windows I can use telnet example.com 25

Any idea?

I was testing on linux server, I didn't got response after telnet, so I thought it is for only windows. — Zohaib Khan, Nov 13 '17 at 12:05

score 1 · Answer 1 · answered Nov 13 '17 at 09:09

1

You should check it from your home PC or another computer than your Linux server. you can use several tools like telnet, curl, netcat (nc) etc.

curl:

$ curl ip_or_domain:25

netcat:

$ nc ip_or_domain 25

in any case if you got 220 hostname SMTP Mail Server this shows that the port is open.

answered Nov 13 '17 at 09:09

Ghasem Pahlavan

1,855

When I am doing then getting error as "curl: (7) Couldn't connect to server" and nc mydomain.com 25 shows no output – Zohaib Khan Nov 13 '17 at 12:15
nc doesn't print out information to stdout but you could check its response like nc ip_or_domain 25 && echo $? if it is 0=> success, if not => failure – derHugo Nov 13 '17 at 17:41
@shahab82 what is the output of curl ip_or_domain 25 -v? – Ghasem Pahlavan Nov 13 '17 at 21:51

How to check whether port 25 is open or not from ssh access to server

1 Answers1