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Tracing through ports

we have a POS system that is supposed to pass information from a station to the server and then the server returns information for this we had to have the upper ISS enable some ports. Now the product vendor is saying the ports aren't open.

Does anyone know if there's a way to send info out through on port so it will hit the server and return through another port, and let us know where it's getting blocked? whether on the outgoing or incoming?
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Trollios
Asked:
Trollios
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1 Solution
 
Kent OlsenData Warehouse Architect / DBACommented:
Hi Trollios,

What platform are you using?
Are you going through a firewall or proxy?

Kent
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TrolliosAuthor Commented:
I would assume it's Sisco. It's just a piece of hardware, that we can't get to.

We have a two-tiered ISS, there's the upperlevel that controls the major servers and there's us that handle smaller servers and workstations.

and it is a firewall.
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Kent OlsenData Warehouse Architect / DBACommented:
Hi Trollios,

It sounds to me that the ports probably are opened at most junctions, but the firewall has a rule preventing the connection from the "outside".

Just a guess....

Good Luck,
Kent
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TrolliosAuthor Commented:
Thanks Kent.

but do you know if there's software that can find out for me for sure?
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Kent OlsenData Warehouse Architect / DBACommented:
Hi Trollios,

There are quite a number of "port scan" solutions out there, but that's probably overkill.

From the two machines in question (the client and the server), can you ping each other?  If so, then basic connectivity is OK.

Is telnet, ftp, ssh or some other protocol/service available that will let you connect from one system to the other?  If so log onto each system and create a connection to the other.  If succesful, so far so good.  :)

If telnet or http is open, use a telnet or browser session to connect to the troublesome port on the other system.  The error messages that you get here should indicate who/what is the trouble.

telnet <ipaddress> [port]

http://ipaddress:port


Good Luck,
Kent
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