ReportViewer control fails via IIS web farm

Aleksey Krotov 1 Reputation point
2022-05-13T12:42:07.917+00:00

I've web farm configuration:

firewall -> IIS farm -> IIS web server
VPN client -> VPN server ---^

IIS Web server hosts ASP .Net MVC site with ReportViewer control, that points to internal SSRS server.
It works fine when I connect through VPN (w/o IIS rewrite rules): 201815-image.png

When I try to reach the same page from Internet I got following error:
201808-image.png

Report Viewer Configuration Error
The Report Viewer Web Control HTTP Handler has not been registered in the application's web.config file. Add <add verb="" path="Reserved.ReportViewerWebControl.axd" type = "Microsoft.Reporting.WebForms.HttpHandler, Microsoft.ReportViewer.WebForms, Version=15.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" /> to the system.web/httpHandlers section of the web.config file, or add <add name="ReportViewerWebControlHandler" preCondition="integratedMode" verb="" path="Reserved.ReportViewerWebControl.axd" type="Microsoft.Reporting.WebForms.HttpHandler, Microsoft.ReportViewer.WebForms, Version=15.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" /> to the system.webServer/handlers section for Internet Information Services 7 or later.

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ASP.NET
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A set of technologies in the .NET Framework for building web applications and XML web services.
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An object-oriented and type-safe programming language that has its roots in the C family of languages and includes support for component-oriented programming.
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2 answers

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  1. Joyzhao-MSFT 15,566 Reputation points
    2022-05-16T02:05:13.607+00:00

    Hi @Aleksey Krotov ,

    Add the following to <system.web> => <httpHandlers> section. 

    <add verb="" path="Reserved.ReportViewerWebControl.axd" type = "Microsoft.Reporting.WebForms.HttpHandler, Microsoft.ReportViewer.WebForms, Version=15.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" />

    Add the following to <system.webServer> => <handlers> section. 

    <add name="ReportViewerWebControlHandler" preCondition="integratedMode" verb="" path="Reserved.ReportViewerWebControl.axd" type="Microsoft.Reporting.WebForms.HttpHandler, Microsoft.ReportViewer.WebForms, Version=15.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" />

    Please refer to: ASP.Net: The Report Viewer Web Control HTTP Handler has not been registered in the application's web.config.

    The Report Viewer Web Control HTTP Handler has not been registered in the application's web.config file
    Best Regards,
    Joy

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  2. Aleksey Krotov 1 Reputation point
    2022-05-17T12:04:38.76+00:00

    @Joyzhao-MSFT what do you think?