Problem
Applications which handle their own authorization or defer directly to off-platform authorization services like Site Minder sometimes encounter an error on execution
500 - Internal server error. There is a problem with the resource you are looking for, and it cannot be displayed. |
If you navigate to the app in IIS Manager and try to edit configuration, you will see an error like: 
The line in question looks like:
<section name="system.identityModel" type="System.IdentityModel.Configuration.SystemIdentityModelSection, System.IdentityModel, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" /> |
Removing this "duplicate" line leads to the app failing to promote:
Configuration system failed to initialize Unrecognized configuration section system.identityModel. (C:\ApprendaPlatform\SiteData\sup139willnotpromote--v1\root\web.config line 699) |
Solution
The platform has a case-sensitive filter for system.IdentityModel which can be defeated by changing the PublicKeyToken value to lower case:
<section name="system.identityModel" type="System.IdentityModel.Configuration.SystemIdentityModelSection, System.IdentityModel, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" /> |
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