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RE: unblock port 25



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 

> -----Original Message-----
> From: redhat-list-bounces redhat com 
> [mailto:redhat-list-bounces redhat com] On Behalf Of 
> Nagarjuna Rao Cherukuri
> Sent: Wednesday, October 26, 2005 2:56 PM
> To: redhat-list redhat com
> Subject: unblock port 25
> 
> 
> 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 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 hydlmuk lib]# hostname
> 
> hydlmuk
> 
> [root 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 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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