unblock port 25

[Wayne Pinette]

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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