Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions

Tracing through ports

Posted on 2003-12-12
Last Modified: 2010-04-09
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?
Question by:Trollios
  • 3
  • 2
LVL 45

Expert Comment

by:Kent Olsen
ID: 9929174
Hi Trollios,

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


Author Comment

ID: 9929362
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.
LVL 45

Expert Comment

by:Kent Olsen
ID: 9929777
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,

Author Comment

ID: 9929831
Thanks Kent.

but do you know if there's software that can find out for me for sure?
LVL 45

Accepted Solution

Kent Olsen earned 400 total points
ID: 9930131
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]


Good Luck,

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Windows Firewall Rules for WMI and multiple subnets 4 90
iptables ubuntu BLOCK all 2 85
PCAnywhere 2 134
Windows Server Firewall Configuration 2 58
Do you have a windows based Checkpoint SmartCenter for centralized Checkpoint management?  Have you ever backed up the firewall policy residing on the SmartCenter?  If you have then you know the hassles of connecting to the server, doing an upgrade_…
This article offers some helpful and general tips for safe browsing and online shopping. It offers simple and manageable procedures that help to ensure the safety of one's personal information and the security of any devices.
A short tutorial showing how to set up an email signature in Outlook on the Web (previously known as OWA). For free email signatures designs, visit https://www.mail-signatures.com/articles/signature-templates/?sts=6651 If you want to manage em…
In a recent question (https://www.experts-exchange.com/questions/29004105/Run-AutoHotkey-script-directly-from-Notepad.html) here at Experts Exchange, a member asked how to run an AutoHotkey script (.AHK) directly from Notepad++ (aka NPP). This video…

809 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question