Re: [courier-users] Courier not accepting external connections atall

permalink · #1 (**permalink**) 02-17-2008

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Bernd Wurst a écrit :
> Hi.
>
> On Sunday 17 February 2008, Mircea Zahan wrote:
>
>>>> helo domain
>>>> 250-dc Ok.
>>>>
>>> 250-dc also is not courier but it's also not standards conform. Tree
>>> digits and a space must be the beginning of the (last) answer line.
>>>
>>> Also, "domain" is propably not resolvable and therefore no good HELO name.
>>>
>> dc is the name of the machine courier is running on.
>>
>
> You replaced "250 dc Ok." by "250-dc Ok." manually? Why?
>
>
>
>> Ok, you're right, I wasn't talking ESMTP.
>>
>
> So, you could try to do this.
>
>
>
>> Bottom line: I do connect to the right machine, the machine receives
>> external TCP connections because they appear in maillog, but courier does
>> not answer anything after accepting the connection. At least that's what
>> the diagnostic tool from www.mxtoolbox.com says.
>>
>
> That may be because your IDENT-lookup is still enabled and the remote client
> does not offer an ident server. Try switching it off (extend TCPDOPTS
> by -noidentlookup).
>
>
> To get valuable assistance, please use
> - correct host names. If your server shall be on the internet, please use
> internet hostnames. Neither "domain" nor "dc" is a FQDN and therefore should
> not be used in the internet. "hostname -f" should give you a full host name,
> containing the name of the machine and the domain it lives in. If that's not
> the case, you should configure your machine's hostname according to your
> operating system's docs.
> - ESMTP. If Courier complains about an ESMTP command error, this may be true.
> - as much from the default configuration as possible. If everything works,
> customize bit by bit and you could keep in mind what worked and what did not.
> If you customize a lot of stuff, there are many places where you could have
> made a mistake or where things could get mixed up.
>
> regards, Bernd
>

If you have several routes on your box, check, that there is no
asymmetrical routing.

HTH.
Jerome Blion.

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Bernd Wurst a écrit :
<blockquote cite="mid:200802171759.58839.bernd@bwurst.org" type="cite">
<pre wrap="">Hi.

On Sunday 17 February 2008, Mircea Zahan wrote:
</pre>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">helo domain
250-dc Ok.
</pre>
</blockquote>
<pre wrap="">250-dc also is not courier but it's also not standards conform. Tree
digits and a space must be the beginning of the (last) answer line.

Also, "domain" is propably not resolvable and therefore no good HELO name.
</pre>
</blockquote>
<pre wrap="">dc is the name of the machine courier is running on.
</pre>
</blockquote>
<pre wrap="">
You replaced "250 dc Ok." by "250-dc Ok." manually? Why?

</pre>
<blockquote type="cite">
<pre wrap="">Ok, you're right, I wasn't talking ESMTP.
</pre>
</blockquote>
<pre wrap="">
So, you could try to do this.

</pre>
<blockquote type="cite">
<pre wrap="">Bottom line: I do connect to the right machine, the machine receives
external TCP connections because they appear in maillog, but courier does
not answer anything after accepting the connection. At least that's what
the diagnostic tool from <a class="moz-txt-link-abbreviated" href="http://www.mxtoolbox.com">www.mxtoolbox.com</a> says.
</pre>
</blockquote>
<pre wrap="">
That may be because your IDENT-lookup is still enabled and the remote client
does not offer an ident server. Try switching it off (extend TCPDOPTS
by -noidentlookup).

To get valuable assistance, please use
- correct host names. If your server shall be on the internet, please use
internet hostnames. Neither "domain" nor "dc" is a FQDN and therefore should
not be used in the internet. "hostname -f" should give you a full host name,
containing the name of the machine and the domain it lives in. If that's not
the case, you should configure your machine's hostname according to your
operating system's docs.
- ESMTP. If Courier complains about an ESMTP command error, this may be true.
- as much from the default configuration as possible. If everything works,
customize bit by bit and you could keep in mind what worked and what did not.
If you customize a lot of stuff, there are many places where you could have
made a mistake or where things could get mixed up.

regards, Bernd
</pre>
</blockquote>
 
If you have several routes on your box, check, that there is no
asymmetrical routing. 
 
HTH. 
Jerome Blion. 
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