How do i enable ports?

Tigger · 05-31-2003, 08:04 PM

Hi

i am using red hat 8 to host mail and web page.

How do i enable port 110 and 25?

When i try to telnet servername port i get connection refused for both of these ports.

I have enabled ipop3 in the ipop3 file and restarted xinetd.

In iptables i have allowed for port 25 (smtp) and have opened up my router for ports 25 and 80.

thanks

markus1982 · 06-01-2003, 02:52 AM

Well you did not mention you have allowed port 110/143 in your iptables ruleset also. Did you do that?

What does netstat -l say ?

Tigger · 06-01-2003, 05:20 AM

how do i enable it on the internal lan?

Do i type iptables -A INPUT -p tcp --dport 110 -j ACCEPT

Is this secure?

thanks

markus1982 · 06-01-2003, 05:29 AM

which interface do you you use for your internal lan ? If you use eth0 for your lan:

iptables -A INPUT -i eth0 -p tcp --dport 110 -j ACCEPT

markus1982 · 06-01-2003, 05:30 AM

of course you can also limit the source:

iptables -A INPUT -i eth0 -p tcp --dport 110 -s 192.168.0.0/16 -j ACCEPT

Tigger · 06-01-2003, 05:38 AM

thanks markus, i will try this tomorrow and let you know

it sure sounds right to me, i have not enabled the port in iptables

is this why when i telnet to servername port 110 i get connection refused?

Yes, i use eth0.

thanks again

markus1982 · 06-01-2003, 09:02 AM

Well if your default rule is DROP and you haven't ACCEPTED the port then of course you get refuse ... if you are on the pop3 server do a netstat -l to check which services are listening to which ports ...

Tigger · 06-01-2003, 08:39 PM

thanks Markus, tried netstat -l and it comes up that pop3 is listening but does not specify a port. Could only see 0. This is same for http and smtp. However, i can send and receive mail across the internet. How can i fix this?

Now when i telnet servername 110 it is working!!! However still cannot use outlook 2002 to log onto the incoming pop3 server which is my linux box!!

thanks

Tigger · 06-02-2003, 02:24 AM

My iptables has the following lines in it:

iptables -A INPUT -p tcp --dport 80 -j ACCEPT
iptables -A INPUT -p tcp --dport 25 -j ACCEPT
iptables -A INPUT -i eth0 -p tcp --dport 110 -j ACCEPT

My mail log says "Did not issue mail/expn/vrfy/etrn during connection to MTA" What does this mean?

What should be in my hosts file? I have got the following:

127.0.0.1 myservername.com mydomain.com

Also forgot to mention that my router is not directly attached to the linux box. it is attached to a switch on the lan

thanks again