Iis – Setting up ‘localhost’ equivalent bindings with IIS7

Probably you forgot top allow the port on the Windows Server firewall. Add TCP port 8080 as allowed protocol. By default Windows Server 2008 doesn't allow connections to that port.

If IIS can't do it, then I recommend a more flexible solution at the gateway using an application-layer firewall like Microsoft TMG (aka ISA) which will allow you to have as many IP's as you want in IIS and for each request coming in on a single public IP on the firewall it can look at the host header and route that to any internal IP to overcome IIS limitations. There is likely other firewalls and reverse proxy's that do it as well I'm just not familiar with them.