There is a duplicate 'myApp' section defined, Internal Server Error
Had a breakdown moment today when two sites didn't behave. Each site had a virtual application with its own web.config.
Both sites where configured almost the same but one of the virtual applications worked and not the other.
The following error was displayed.
HTTP Error 500.19 - Internal Server Error The requested page cannot be accessed because the related configuration data for the page is invalid. Detailed Error Information: Module IIS Web Core Notification BeginRequest Handler Not yet determined Error Code 0x800700b7 Config Error There is a duplicate 'myapp' section defined Config File \\?\c:\MyApp\vapp\web.config Requested URL http://myapp:80/vapp/ Physical Path c:\MyApp\ Logon Method Not yet determined Logon User Not yet determined Config Source: 7: <configsections> 8: <section name="myApp" type="MyApp.MyConfigSection, MyApp"/> 9: </configsections>
This configuration section was present in my site as well, like below.
<section name="myApp" type="MyApp.MyConfigSection,MyApp"/>
Removing the section from the vapp did the trick, but why did it work on the other site?
Finally after some testing and borrowing a second pair of eyes (thx robert), a small difference in the setup was detected. One of the sections where declared with the type "MyApp.MyConfigSection, MyApp" and the other with "MyApp.MyConfigSection,MyApp". Did you see it?! A small whitespace between the type and assembly names where missing.
After adjusting the typo to either keeping the whitespace or removing it on both, it started to work...
