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My ISP just sent me over a box and now I am online. I am afraid of beeing exposed directly to the internet. Is there any website or web app which can check to which level my machine is accessible from the internet?

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I believe this is on topic because it is looking for a web application to accomplish a task, and there is a clear and great one to use, as already provided in the answers. –  danivovich Jun 30 '10 at 23:31
I don't understand why it was closed. Surely a web-based firewall test is a web application. –  conorgriffin Jun 30 '10 at 23:43
It's not offtopic, it just needs another title like: "Web App to check my machine exposure to the internet" –  Luis Enrique Leon Jul 1 '10 at 0:25

1 Answer 1

up vote 14 down vote accepted

Try 'Shields Up' by GRC

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