Opening ports

[Lucas Holt]

Does courier-imap do smtp?  Sendmail doesn't listen for outside mail by 
default, but in some cases it does listen on port 25 witout accepting 
connections.  look at /etc/rc.conf and see what you have enabled. 
(firewall, courier and sendmail related variables)



On Fri, 17 Dec 2004, Curtis Vaughan wrote:

>
> On 17 Dec, 2004, at 09:24, Curtis Vaughan wrote:
>
>> I realized that apparently by default most all ports are closed on my 
>> 5.3-Release box. The reason I say this is because besides port 22, 80 and 
>> 10000 no other port seems to be open (based on a port scan). I just 
>> installed postfix and courier-imap and wanted to test ports 25 and 110, but 
>> they do not respond even though postfix is running, I have enabled the 
>> ports in master.cf. Also they are in /etc/services.
>> 
>> Looking over documents and checking my install, /etc/rc.firewall is not 
>> enabled in /etc/defaults/rc.conf.
>> 
>> I assume I could go through rc.firewall and set it up for those ports I 
>> need opened, and enable it in rc.conf, but whereas we have a 
>> gatewall/firewall for our company, I don't see a lot of
>> reason for having all the ports closed down on this server. Is there an 
>> easy way to enable them all?
>> 
>> Curtis
>> 
>
> OK, I've got courier-imap running now and it opened port 143, but there is 
> still no reply on 25. Which makes me think that the problem isn't the fact 
> that ports are closed, but that nothing is listening.
> However, netstat shows:
>
> cod# netstat -na | grep LISTEN
> tcp4       0      0  *.143                  *.*                    LISTEN
> tcp6       0      0  *.143                  *.*                    LISTEN
> tcp4       0      0  *.80                   *.*                    LISTEN
> tcp4       0      0  *.25                   *.*                    LISTEN
> tcp4       0      0  *.10000                *.*                    LISTEN
> tcp4       0      0  *.22                   *.*                    LISTEN
> tcp6       0      0  *.22                   *.*                    LISTEN
>
> So, something is listening on port 25, but why no response to telnet 
> requests?
>
> Curtis
>
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