ERRMSG: A potentially dangerous Request Form value was detected from the client

After installing InstantForum.NET or InstantKB.NET under .NET 4.0 you may receive the following error when trying to save articles or post topics with HTML inside...

A potentially dangerous Request.Form value was detected from the client (strSearchEventArgsXML="<s/>").
Resolution

1. Open your web.config file and locate the <httpRuntime> element  This may look like...

<httpRuntime maxRequestLength="30720"  />

2. Update the httpRuntime element and add the requestValidationMode attribute as shown below...

<httpRuntime requestValidationMode="2.0".maxRequestLength="30720"  />

That's It!

Implementing these suggestions should resolve this exception message. If you require further assistance please don't hesitate to open a support ticket or contact us.