This is my 3rd full day working on this and I'm out of leads to follow.
I have an application that runs under Visual Studio 2012. I installed VS2013 then tried launching the site. Immediately I received the 500.19 error.
I resolved this by tinkering with the applicationhost.config in the IISExpress directory used by VS2013.
I changed this to "allow" which permitted my applications web.config to set the application to us Windows Auth.
<section name="anonymousAuthentication" overrideModeDefault="Allow" />
That made a difference and my page now loads but the CSS and Obout dialog controls do not load.
I have searched and searched for anyone else having a similar problem but I can't find it. I have also changed nearly every setting I could find in this applicationhost.config with no joy.
I wish there was a way to go back to launghing the application from the IDE instead of using the IISExpress. I don't want to go back to VS2012 so I'll keep pressing forward.
If anyone has any ideas of things I can try I'd appreciate it.
Thanks...