I found various posts on this suggesting to use <httpRuntime requestValidationMode="2.0" /> in <system.web> in web.config and also to set enableEventValidation="false" on the <pages> directive.
The solution for me, on top of doing the above, was to remove the attribute controlRenderingCompatibilityVersion="4.0" from the <pages> directive.
Final config which fixed the issue looked like this:
A potentially dangerous Request.Form value was detected from the client
Using Umbraco 6.1.6 CMS console on a new project to save data from a rich text field I encountered the error:
"A potentially dangerous Request.Form value was detected from the client"
Environment included uSiteBuilder 1.2 and Umbraco 6.1.6 (fresh install)
I found various posts on this suggesting to use <httpRuntime requestValidationMode="2.0" /> in <system.web> in web.config and also to set enableEventValidation="false" on the <pages> directive.
The solution for me, on top of doing the above, was to remove the attribute controlRenderingCompatibilityVersion="4.0" from the <pages> directive.
Final config which fixed the issue looked like this:
<httpRuntime requestValidationMode="2.0" enableVersionHeader="false" />
<pages enableEventValidation="false">
Try below link. Solution for this issue step by step.
http://blogershub.com/Archive/2013/12/A-potentially-dangerous-Request-Form-value-was-detected-from-the-client-in-ASP-NET-WebForms
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