RE: Available port numbers

["PW Botha Ananzi" <pwbotha@xxxxxxxxxxxx>]

Try

WRKSRVTBLE

-----Original Message-----
From: owner-web400@midrange.com [mailto:owner-web400@midrange.com]On
Behalf Of Jim Langston
Sent: 18 May 2001 06:56
To: WEB400@midrange.com
Subject: Re: Available port numbers


Do you want to know what the *standard* port numbers are?

In Windows open up the file C:\WINDOWS\SERVICES in any text editor.  These
list the standard port numbers for various applications.  In Windows NT it
is under C:\WINNT\SYSTEM32\drivers\etc\services

When looking for a free port for your own application, don't pick one that
is a standard for something else.

Don't pick 12345 or 37337 either, as those are used by popular trojan back
door programs.

I don't believe the same type of file exists on the AS/400, but I may be
mistaken.

Regards,

Jim Langston

I thought I was wrong once, but I was mistaken.


Andrew.Lutz@abbott.com wrote:
>
> Simon,
>
> Thanks for the additional tip with regards to using WRKSRVTBLE in addition
to
> NETSTAT,  it would appear that neither tool provides a complete picture
> though.....
>
> My understanding is that you should start looking for port assignments
above
> 1024 any recommendations?
>
> Andrew
>
>
>                     "Simon Coulter"
>                     <shc@flybynight        To:     WEB400@midrange.com
>                     .com.au>               cc:
>                     Sent by:               Subject:     Re: Available port
numbers
>                     owner-web400@mi
>                     drange.com
>
>
>                     05/17/2001
>                     11:51 PM
>                     Please respond
>                     to WEB400
>
>
>
> M
> Hello Lucille,
>
> You wrote:
> >I need to find an available port number on the AS400 to specify on my
> >instance of the server.  At present, there does not appear to be any
AS400
> >command that will list available port numbers or numbers that have been
> >taken up.  Does anyone know of a simple way of finding out this
information?
>
> You need to examine the contents of the services file.  Run the command
CFGTCP
>
> and take option 21 and then option 1 (or just run the WRKSRVTBLE command).
> The
> resulting list is the list of assigned ports.  Not all of them will be
active
> on
> your system but you should not use any of the assigned ports unless you
have a
>
> very good reason for so doing.
>
> Pick a port number that is not in the list and use that for your
application.
>
> If your application is written properly it should be telling you to add an
> entry
> in the services table and the application will use the port associated
with
> the
> entry.
>
> It is not sufficient to use NETSTAT to determine available ports because
that
> lists only the active ports not the assigned ones.
>
> Regards,
> Simon Coulter.
>
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