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  • Status: Solved
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How to check if port is open but bloked by firewall

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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trazodone
Asked:
trazodone
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3 Solutions
 
woolmilkporcCommented:
Try a simple port scanner like this one:

http://www.radmin.com/products/previousversions/portscanner.php
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trazodoneAuthor 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.
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woolmilkporcCommented:
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?
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Dave BaldwinFixer of ProblemsCommented:
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.
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trazodoneAuthor Commented:
Thank you
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