Running IIS and Confluence both on port 80 (multiple IP addresses)

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http://serverfault.com – I'm running Windows Server 2008 with IIS and Confluence. The server has two ip addresses setup at Network Settings. Confluence is setup to use the second IP address. Both IIS and Confluence seem to startup fine (no errors in logs). However I can't reach Confluence. As soon as I set the port to 8090 i can see Confluence. Is it possible to use two IP addresses on your server like this? (HowTos)