Error: HTTP Error 500.19 - Internal Server Error on testconfig BBappfx service line after upgrading to NetCommunity 7.1

After upgrading to NetCommunity 7.1 and viewing the testconfig page locally on the NetCommunity webserver the bbappfx and content management endpoint lines are failing with the error: HTTP Error 500.19 - Internal Server Error. 
Previous versions of NetCommunity required that a sameorigin value for the x-frame options HTTP response header be added in IIS to address PCI compliance standards. In NetCommunity 7.1 that value is added directly in the BBappfx web.config file. Checking the event viewer application logs on the NetCommunity webserver will reveal the following error:
  • cannot add duplicate collection entry of type 'add' with unique key attribute 'name' set to 'X-frame-Options'.
Removing the x-frame options entry from HTTP response Headers in IIS and recycling the application pools will resolve the error.
 

Environment

 Blackbaud NetCommunity
 7.1

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