Port problem on opensuse 11.1

ZenAnthro · 11-12-2010, 01:38 AM

Hi,

I have a linux firewall running, but it seems even if I open a port and restart the configuration, I am still unable to use those ports. I have tried opening the ftp port, IMAP and smtp but none seem to allow me to get through. The box is also running a squid proxy, but I thought that squid only handled http requests?

Any ideas to what could be the cause, or at least finding out what could be blocking it?

repo · 11-12-2010, 05:54 PM

How are you connecting?
From inside the LAN, from outside? from the server itself?

Kind regards

ZenAnthro · 11-16-2010, 06:19 AM

I am trying to connect to a mail server that is outside the Lan, from inside the lan.

repo · 11-16-2010, 11:12 AM

How do you connect?
pop3, imap, ssl, smtp....
What happens if you disable the firewall?
What happens if you do

Code:

telnet IP 110

Kind regards

ZenAnthro · 11-17-2010, 07:19 AM

Thanks for the replies repo, I appreciate it.

I am trying to connect to both IMAP and send through smpt.

I tried turning off the firewall with the following commands:

Code:

> iptables -F
> iptables -X
> iptables -P INPUT ACCEPT
> iptables -P FORWARD ACCEPT
> iptables -P OUTPUT ACCEPT

but with no success.

If I try to telnet xxx.xxx.xxx.xxx 110 (my mail hosting provider) they block the type of connection. I cannot telnet from inside the proxy server though.

MAIL HOST
|
BROAD BAND MODEM
|
PROXY (eth0 connected to switch and eth1 connected to modem)
|
SWITCH
|
REST OF LAN

ZenAnthro · 11-26-2010, 02:45 AM

[SOLVED]

I don't know if it is best practice, but the only solution that I found to this problem was masquerading the ports in the iptables.