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  • Subject: Re: re.TCP/IP problems
  • From: "Dennis Lovelady" <dennis@xxxxxxxxxxxx>
  • Date: Sun, 3 Jan 1999 21:59:25 -0500

Hello, Christopher:

>Thanks for responding .
>
>My pc is not in the same network as that of the AS400.  I am trying
>to connect through the internet .
>
>The same Mochasoft 5250 worked perfectly when I used it in a PC
>connected to the same network as that of the AS400.
>When I ping the IP address I get the response
>          'reply from ... , bytes= , time<.. ,TTL'
>Is it Ok.

Then most probably, either your emulator is incorrectly configured, or a
firewall is preventing your access (?).  The person(s) in charge of your
network access should be able to answer firewall questions.  Try configuring
your emulator to connect by IP address rather than hostname (the same IP
address that you used in your ping).  If that is unsuccessful, then your
network group should be able to help you.

>What is the proxy server concept , can anyone please explain.

A proxy server is a server that takes IP connection requests on a port,
authorizes them in some fashion, and (if OK) passes them on to the intended
destination on another port.  For example, telnet requests are usually sent
via port 23.  However, a firewall may be set up to prevent access to port 23,
disallowing all "normal" telnet access.  At the same time, another server (or
the firewall) may take requests to some other port (say 2323, for example),
determine that the access attempt is valid, then maintain the connection
between you (at port 2323) and the AS/400 (at port 23).  In this case, it is
operating as a proxy for you.

I hope that's a little clear at least.
--
Dennis Lovelady                    Simpsonville, SC
mail: dennis@lovelady.com
URL:  http://lovelady.piedmont.net
ICQ:  5734860
--
"You can make more friends in two months by becoming interested in other
people than you can in two years by trying to get other people interested in
you."
        - Dale Carnegie


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