unblock port 25

[Wayne Pinette]

Im not sure what smtp server you are using, if it's sendmail,
then Marco Shaw's response is what you need :

<advice type="good" author="Marco Shaw">

Something else to check out:

http://www.linuxselfhelp.com/quick/sendmail.html 

Check #6, some versions of RedHat come with a
'secured' sendmail that will only listen on 127.0.0.1.

The netstat suggestion will also point that out.

Marco
RHCE 
</advice>

If you are using Postfix you want to edit /etc/postfix/main.cf

In there you want to make sure you have inet_interfaces=all.  Usualy
postfix is compiled with this
as the default action, but just in case, put inet_interfaces=all there
and restart postfix.

Wayner


>>> Nagarjuna_Cherukuri at infosys.com 10/26/05 11:07 am >>>
Yes, netstat -i shows me that port 25 is listening only for local
host.

[root at hydlmuk lib]# netstat -l | grep 25
You have new mail in /var/spool/mail/root
[root at hydlmuk lib]# netstat -l | grep -i smtp
tcp        0      0 localhost.localdom:smtp *:*
LISTEN
[root at hydlmuk lib]#

How can change my smtp server configuration?

-----Original Message-----
From: Wayne Pinette [mailto:Wpinette at tru.ca] 
Sent: Wednesday, October 26, 2005 11:31 PM
To: Nagarjuna Rao Cherukuri; redhat-list at redhat.com 
Subject: Re: unblock port 25

do a netstat -l and see if your program is listening to port 25 (smtp)
for all interfaces and areas, or if it is just listening on
localhost.localdomain.

if it only shows listenting to smtp on localhos.localdom and not ont *
or hostname, you need to reconfigure your smtp server to make sure
it's
listening on more than just localhost.

Also, make sure your iptables isn't blocking port 25.  The easiest way
to ensure that is to turn it off while testing :
/etc/init.d/iptables stop  will do this.


Wayner


>>> Nagarjuna_Cherukuri at infosys.com 10/26/05 10:55 am >>>

Hi,



Can anyone tell me how to enable port 25 in my server? I am able to
ping
to this port as local host, but it is failing when try to ping using
DNS.



[root at hydlmuk lib]# telnet localhost 25

Trying 127.0.0.1...

Connected to localhost.localdomain (127.0.0.1).

Escape character is '^]'.

220 hydlmuk.ad.infosys.com ESMTP Sendmail 8.11.6/8.11.6; Wed, 26 Oct
2005 23:15:11 +0530

quit

221 2.0.0 hydlmuk.ad.infosys.com closing connection

Connection closed by foreign host.

You have new mail in /var/spool/mail/root



[root at hydlmuk lib]# hostname

hydlmuk

[root at hydlmuk lib]# telnet hydlmuk 25

Trying 172.25.125.203...

telnet: Unable to connect to remote host: Connection refused



My nmap output is as follows.



[root at hydlmuk lib]# nmap hydlmuk



Starting nmap V. 2.54BETA22 ( www.insecure.org/nmap/ )

Interesting ports on hydlmuk.ad.infosys.com (172.25.125.203):

(The 1528 ports scanned but not shown below are in state: closed)

Port       State       Service

21/tcp     open        ftp

22/tcp     open        ssh

23/tcp     open        telnet

110/tcp    open        pop-3

111/tcp    open        sunrpc

143/tcp    open        imap2

1521/tcp   open        ncube-lm

5010/tcp   open        telelpathstart

5680/tcp   open        canna

6000/tcp   open        X11

22273/tcp  open        wnn6

22289/tcp  open        wnn6_Cn

22305/tcp  open        wnn6_Kr

22321/tcp  open        wnn6_Tw



can anyone tell me how to resolve this issue?



thanks

nagarjuna



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