How to check if port is open but bloked by firewall

trazodone
trazodone used Ask the Experts™
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Hello Experts,

I have Solaris 10 SPARC running on my customer side. I have root account so that I can install any software. Last time I install monit which making port 2812 Listen and I can access locally. On my side I use VPN connection to customer server. When I try to check port 2812 is inaccessible even port in Listening. I realized that port may be blocked by some firewall. My object is to find some port that accessible. The question is how to check which port is allowed by firewall to access?

Thank you.
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Most Valuable Expert 2013
Top Expert 2013
Commented:
Try a simple port scanner like this one:

http://www.radmin.com/products/previousversions/portscanner.php

Author

Commented:
Hi,

Port scanner will result in open port that already listen. It mean that I cannot config my application to use that port because it has already reserved by other application already, Am I correct? My point it to find port that is open,allowed access by firewall,and not reserves by any application.
Most Valuable Expert 2013
Top Expert 2013
Commented:
Normally, a firewall would block all ports except for those deliberately opened.
So why don't you just ask your or your customer's firewall admin(s) to open port 2812 for you?
Fixer of Problems
Most Valuable Expert 2014
Commented:
The only ports that are "open" are those that have a program listening to them.  If there is no listener, it is by definition, not open.

Author

Commented:
Thank you

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