[Cialug] Cannot retrieve mail through internal nework

[Chris Van Cleve]

Dave W,

It was indeed missing the inet_interfaces directive. Unfortunately,  
adding that didn't correct the problem.

Dave C,

Thanks for the main.cf I compared yours with my old one and my new  
one, and updated the new one accordingly. No change.
Using nmap, I see port 25 is open, but port 110 is not. (confused)

Josh,

Using your method I admit to being noting but confused. ;) Here is te  
output I get when running that command:

debug1: sshd version OpenSSH_4.2p1 Debian-7ubuntu3
Could not load host key: /etc/ssh/ssh_host_rsa_key
Could not load host key: /etc/ssh/ssh_host_dsa_key
debug1: setgroups() failed: Operation not permitted
debug1: rexec_argv[0]='/usr/sbin/sshd'
debug1: rexec_argv[1]='-p'
debug1: rexec_argv[2]='25'
debug1: rexec_argv[3]='-D'
debug1: rexec_argv[4]='-d'
debug1: Bind to port 25 on ::.
debug1: Bind to port 25 on 0.0.0.0.
Bind to port 25 on 0.0.0.0 failed: Permission denied.
Cannot bind any address.

So I ran the netstat command and got:

(No info could be read for "-p": geteuid()=1000 but you should be root.)
tcp        0      0 0.0.0.0:25432           0.0.0.0:*                
LISTEN     -
tcp        0      0 127.0.0.1:34694         127.0.0.1:45825          
ESTABLISHED-
tcp        0      0 192.168.1.101:25432     12.206.145.136:2771      
TIME_WAIT  -
tcp        0      0 192.168.1.101:25432     12.206.145.136:2772      
TIME_WAIT  -
tcp        0      0 127.0.0.1:45825         127.0.0.1:34694          
ESTABLISHED-

12.206.145.136 is my WAN (Internet) IP

Unfortunately I have no idea what that's telling me. I'm presently  
reading man for netstat. Heh.

Chris VC

On Jun 30, 2006, at 11:49 AM, Josh More wrote:

> 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
>
> _______________________________________________
> Cialug mailing list
> Cialug at cialug.org
> http://cialug.org/mailman/listinfo/cialug

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