[Cialug] Cannot retrieve mail through internal nework

[Josh More]

I would suspect a firewall issue.

To test this, you can use sshd.  

1) Shutdown postfix and whatever you are using for POP
2) Run "`which sshd` -p 25 -D -d"
2-e) If this fails to start, the problem is that something is listening
on port 25.  Use "netstat -atunp | grep 25" to troubleshoot.
3) From the client machine, issue "ssh ip.ip.ip.ip -v -p 25"
3-e) If this fails to connect, check for error messages on both the
server and client ssh screens.  This will help you debug any connection
problems.

Note: when you close the client ssh call, it will also exit on the
server.  To perform multiple tests, you need to manually restart the
server piece as well.

Hope this helps,



-- 
-Josh More, RHCE, CISSP, NCLP 
 morej at alliancetechnologies.net 
 515-245-7701
>>> vanish at dreamscapevisionery.com 06/30/06 11:38 AM >>>
I decided to rebuild an old 1.2 GHz P4 box as a linux server to host  
my family web site and email. Since I was in an adventurous mood, I  
installed Ubuntu to try it out. (Love it, btw. Finally a usable  
Debian. ;) ) I am having two problems with it though, one of which  
I'm hoping the Linux Geniuses here can help me figure out.

The box is running Postfix because I'm used to it, and I think it's  
the best mail server. It's working flawlessly. My router is  
configured to forward ports 25 and 110 to that box. Using Webmin, I  
am able to send an receive email just fine. Everything sounds good,  
right? Here's the catch:

I have 4 other PCs on my home network, all of which are configured to  
use my home domain for email. None of these machines, through various  
clients, is able to connect to the Ubuntu box. I am getting denial  
messages for port 110 and port 25 when trying to receive/send mail  
respectively. I thought at first it was a resolution problem (and  
spent a good chunk of time playing with host files), but all 4 PCs  
correctly reach the box's webmin interface using the domain name.

Any ideas?

Chris VC