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various services such as IIS and FTP are using the external IP address without problems.

Unfortunately some other apps are having difficulty validating such IP, in fact when using the ipconfig command the IP does not show up!

What could this be? Anyway I can fix this?

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More detail please. – joeqwerty Jan 11 '11 at 12:08
Maybe its nated.. more info. – voodooo Jan 11 '11 at 13:45
up vote 1 down vote accepted

If you server is behind a firewall (NATed) there is not an external ip address on the server.

If you server is connected directly to the internet, try wiht ipconfig /all.

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