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How can I verify ports 80 and 443 are open?

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tale103108
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Joined: 2012-06-27

Linux RHEL 6.3
GlassFish 3.0.1

I have a web app I just installed on a new GlassFish web server and I can access it internally (port 8080), But when I try to access it from 'outside', I can not see the app. The firewall settings have been verified as ok. How do I verify that port 80 and 443 are open for this app?