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Home > ADX, CRM > ADX Portals – Cannot register for ‘OnSendingHeaders’ event

ADX Portals – Cannot register for ‘OnSendingHeaders’ event

Other day, while configuring portal on a new CRM instance, portal shown error page, up on clicking the ‘Apply’ button.

License_Error1

There were no details on error screen to deduce the reason. So we had to go to the server where our portal website hosted.

When checked the ‘Event Viewer’ logs in Portal server, there was this following exception:

Exception type: InvalidOperationException

Exception message: Cannot register for ‘OnSendingHeaders’ event after response headers have been sent.

Reason & Fix:

  • CRM instance was missing ‘Adxstudio License Key’ record.
  • Post CRM connection, ADX would first check for the valid ‘License Key’. Since there was no ‘License Key’ record, Portal thrown error.
  • To fix this, add the ‘License Key’ by going to ‘Advanced Find -> ADXStudio License Keys‘, add a key.

License_Error2

🙂

 

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