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unblock port 25


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

[root hydlmuk lib]# telnet localhost 25


Connected to localhost.localdomain (

Escape character is '^]'.

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


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


[root hydlmuk lib]# telnet hydlmuk 25


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 (

(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?



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