A few days ago I noticed that smooth streaming had stopped working in my development machine. Every time I tried to GET a manifest, I received the infamous HTTP Error 500.0 – Internal Server Error screen.
My first try to fix this was, obviously, reinstalling the IIS Media Services package. Sadly, that didn’t help.
After that, I started to think that the problem could be in the handler mapping, so I took a look at them in IIS and I found that the SmoothHandler in the Default Web Site has an Unspecified path type instead of the usual File path type.
Changing the path type back to File, solved the issue.
Alternatively, if you don’t have local configurations, you can revert the Handler Mappings to its parent.
Hope this helps,