Adding port 25 to iptables won't getting to open centOS
6,570
The iptables rule is fine, but according to nmap's output I don't think that you have any service running in that port.
Confirm that by running the following command:
netstat -nltp | grep 25
If the output does not show anything in that port, be sure to start the appropriate service.
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Author by
user968898
Updated on September 18, 2022Comments
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user968898 over 1 year
I am facing a problem to open port 25 with iptables on my CentOS machine. I checked the connection by 'nmap' and 'telnet' but both failed.
The follow things I did to trying make this work:
iptables -I INPUT -p tcp --dport 25 -j ACCEPT /sbin/service iptables save /sbin/service iptables restart
OUTPUTS:
# iptables -L -n Chain INPUT (policy DROP) target prot opt source destination ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:25 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:32315 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:443 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:8443 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:25 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:465 Chain FORWARD (policy DROP) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination # nmap localhost Starting Nmap 5.51 ( http://nmap.org ) at 2014-02-08 01:46 CET Nmap scan report for localhost (127.0.0.1) Host is up (0.000015s latency). Not shown: 996 closed ports PORT STATE SERVICE 80/tcp open http 443/tcp open https 2222/tcp open EtherNet/IP-1 8443/tcp open https-alt Nmap done: 1 IP address (1 host up) scanned in 0.16 seconds
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Zoredache about 10 yearsHow exactly do you know there is a problem? What are you doing that is failing? Are you trying to run a mail server, or what? If a mail server, then are you sure it is running? We need more details here.
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