New to Telerik Reporting? Download free 30-day trial

HTTP Error 503.0 error


Product Progress® Telerik® Reporting

Error Message

HTTP Error 503.0 error

Cause\Possible Cause(s)

The error message appears when InProcess hosting is used in .NET Core 2.2 applications.


  1. Remove the following line from the CSPROJ file and keep using .NET Core 2.2:
  1. Upgrade to .NET Core 3.0 or downgrade to .NET Core 2.1.

Note that in .NET Core 2.1 the problem does not exist and in .NET Core 3.0 the problem has been solved.

In this article