Unable to add pages to the Gallery in ArcGIS Enterprise Sites when the Gallery contains 10 pages and the Site has more than 40 pages.

Additional Information

Workaround

Create a new web.config file at C:\inetpub\wwwroot where ArcGIS Web Adaptor with Portal for ArcGIS is installed using the following code snippet:

<?xml version="1.0" encoding="UTF-8"?>

<configuration>

    <system.webServer>

        <security>

            <requestFiltering>

                <requestLimits maxUrl="10999" maxQueryString="9999" />

            </requestFiltering>

        </security>

    </system.webServer>

    <system.web>

        <httpRuntime maxUrlLength="10999" maxQueryStringLength="2097151" />

        <customErrors mode="Off" />

    </system.web>   

</configuration>

Steps to Reproduce