Opening ports
Curtis Vaughan
curtis at npc-usa.com
Fri Dec 17 10:52:04 PST 2004
Forget all my questions!
I was right. Postfix was choking on my access file (or the lack
thereof). Once I got it fixed then postfix started working and
listening on port 25.
Curtis
On 17 Dec, 2004, at 10:37, Lucas Holt wrote:
> 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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