Problem connecting to IIS from Server 11 advanced

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Am having probs setting up IWP on our Windows server (running server 2008). When I try to set up IWP in Filemaker server it can't find the IIS server, regardless of whether I use localhost, the direct IP or server name. I just get a 'Web server test failed. Returned code =-1.

We currently have exchange server running through IIS for webmail on port 80, so am using 8080 for Filemaker but no joy. It's as if it can't see the IIS or can't access it, but the error code is less than helpful.

I did read somewhere that when setting up server, you need to have an anonymous login enabled for filemaker to access IIS, is this correct? This is enabled both for the IIS server and the website itself, so would have thought that's all that was required...