Multisite WP redirects example.com/ to example.com/index.html

I have set up my site successfully with apache2 and a vhost on a sub domain, so actually blog.example.com/ however the default domain gets redirected to blog.example.com/index.html and so does any request to blog.example.com/index.php

However what works is blog.example.com/? (with the question mark for empty parameters and the blog.example.com/blog/2012/…., etc. Also the other blogs work just fine blog.example.com/toms-blog/?, etc.

I have experimented a good bit, but can’t get the redirect to behave properly.

All hep much appreciated

K<o>