unblock port 25
Shaw, Marco
Marco.Shaw at aliant.ca
Wed Oct 26 18:05:19 UTC 2005
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 at redhat.com
> [mailto:redhat-list-bounces at redhat.com] On Behalf Of
> Nagarjuna Rao Cherukuri
> Sent: Wednesday, October 26, 2005 2:56 PM
> To: redhat-list at 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 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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