Sys.WebForms.PageRequestManagerServerErrorException 12031

Question

I\'m occasionaly getting the following popup from an AJAX.NET application

Sys.WebForms.PageRequestManagerServerErrorException: An Unknown error occurred while proc         


        

Answer 1

add
in web.config and in YourPage.aspx set (ClientIDMode="Static" ValidateRequest="false")

::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

EXAMPLE: web.config