topic Re: open port 25 in Operating System - Linux

open port 25

Ragni Singh — Wed, 17 Jan 2007 17:38:23 GMT

In linux, what command would you use to open port 25 for outbound mail. How do I check it.

service sendmail, shows its running but we can't seem to send e-mail out.

Points will be assigned.

Re: open port 25

Ragni Singh — Wed, 17 Jan 2007 17:50:56 GMT

in the /etc/sysconfig/sendmail, change daemon from no to yes, restart sendmail.

Re: open port 25

Ralf Hildebrandt — Fri, 19 Jan 2007 04:08:55 GMT

a) You'd have to check if "iptable" are maybe blocking outbound connections ("iptables -L")

b) Then you'd have to check if your routers or firewalls are blocking port 25 outbound

c) Then you'd have to check if your ISP is blocking port 25 outbound

In any case you can use:

% telnet mail.charite.de 25

to check if you can create outbound connections.

Re: open port 25

{-_-} — Sat, 20 Jan 2007 23:25:35 GMT

Sanjit,

netstat -nap | grep :25 and see if there are any local connections listening on that port. Daemons (such as sendmail) will typically open and close ports as needed without any user intervention needed. Good luck with your issue.

ken