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Can you be a bit more specific and say which firewall you're using and in which configuration?

Are you in a corporate environment or is this your own setup at home???

It's safe because from the internet side of the router there's no way to initiate contact with any computers on the private side (unless the router has been explicitly configured to allow certain types of contact).

Unfortunately that means that some communications protocols which try to send the address of computer A behind a NAT router over to computer B somewhere on the internet are destined to fail.

Microsoft Support has a knowledgebase article that gives essentially the same overview, though their discussion is limitted to Windows 2000 Internet Connection Sharing as the NAT router.

(Step one of their "workaround" is to install a proxy server instead, which is no small amount of work.) Whether you're using Windows internet connection sharing or some other type of NAT router the concepts and the resulting problem are the same.

I'm assuming you're on a network of some description and this isn't just a local firewall.

These boxes allow you to connect one or more computers to your high speed internet connection.Just discovered that we need to be able to receive and answer ping requests (ICMP packets) aswell for this to work.I tried blocking them in my firewall and MSN Messenger audio conversations no longer connected. I haven't had my firewall working with this for ages - it just stopped working one day.Important: Make sure you've got the latest security updates installed for Windows XP before using it.If you are using a cable ISP, you may be behind their router and not have been assigned a publicly accessible IP Address.

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