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A number of websites claim that a complete port scan to fully test a firewall can not be performed across the Internet because it would take many hours, possibly days to complete.

JFirewallTest is a two stage approach that can test all 65,536 ports in under 10 minutes.

The first stage is to create a list of ports that are waiting for connections locally. JFirewallTest performs this action by making dummy connections to all ports on your local machine. To speed up operation JFirewallTest is multi-threaded and is therefore not slowed down by pending responses. The list of open ports is sent to this web site for the second stage.

The second stage is to test each open port to see if it is accessible from the Internet. This is performed by a cgi script on this server and the results are displayed live to the user.

The cgi script needs a bit more work, I'm hoping to link it to a port database and list common trojans in the next few days.

More information here:
http://firewalltest.hostyourself.net/