Custom block page with ASM

I agree with not wanting to be specific in the error response, it would just be to somehow inform the end user that their request was blocked because they entered an illegal character. Most of these end users are going to be very computer illiterate, so when they get a generic block page, they're most likely going to resubmit the same form 5x and then quit from frustration before realizing that they accidentally entered a right bracket in their first name when hitting enter.

 

Thanks for the input and the violation resource data. I'll see what I can do and try to find a good solution without weakening the security.