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If the IIS all components are not installed the 500.19 error will be generated.

(Issue: missing the aspnet_client and HTTP not installed on the IIS server )


Solution :

Go to the server where the IIS and TnA is deployed.

Go to Server Manager and right click on Manage > Add Roles and Features


Highlight the Features.

Locate the NET Framework 4.5 Features and ensure that the HTTP is checked. If not checked, place a checkmark and proceed with the installation. (Reboot of computer may required.)