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We are unable to identify your problem from the provided information. Could you please provide answers for the following queries?
Which version of Syncfusion assemblies are you using?
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Are you unable to run your application after adding Syncfusion MVC assemblies?
The KB article provided in our website is just one of the possible way to rectify the windows authentication error. But there may be other reasons which could be the cause of this problem. The following methods are other possible ways to resolve this error.
You can increase the maxQueryString attribute value in the <requestLimits> in <system.webServer>.
If you use form in your application, then better to remove the method attribute instead of set that value to “get”.
If still you face the problem, please provide more information regarding this, so that we could analyze and provide a solution at the earliest.
Francis Paul A
We are happy that the provided information helped. Please let us know if you need any further assistance.