I would check the basics first and ensure that (using the FileMaker Server Admin Console) Web Publishing is enabled and running and that you have the green lights in the overview section for the web server and php. Finally check that the account you are logging in with has the php extended privilege in the associated Privilege Set.
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Thanks so far.
1 Bit the bullet and reinstalled IIS, restarted server a couple of times.
2 Now IIS default page appears.
3 added code on IIS default page to point to required home page
4 now to get it visible to outside world