Original User: PietaS175
The problem lies with the query tool that saves all the values for the field(s) being queried in the configuration file (tools.xml). This bloats the config file to enormous proportions. The default settings in web.config file can't deal with this large request.
I have modified my code to not save the values in the config file. You can also delete the values afterwords but that also breaks the configuration of the tool in future
Also, make the following changes to the web.config file in inetpub/wwwroot/Builder folder
bits in bold are important
<configuration>
<system.web>
<compilation debug="true" />
<httpRuntime maxRequestLength="2097151" />
...
<security>
<requestFiltering>
<requestLimits maxAllowedContentLength="1048576000" />
</requestFiltering>
</security>
</system.webServer>
</configuration>