The client (?) encountered a potentially dangerous Request.Path value.

The client (?) encountered a potentially dangerous Request.Path value.

Explanation: An unhandled exception occurred while executing the current web request. Review the stack trace for more information about the error that occurred and where the error occurred in your code.

Exception information: System.Web.HttpException: Client (?) encountered potentially dangerous Request.Path value.

Source error:

Stack trace:

[HttpException (0x80004005): 클라이언트 (?)에서 잠재적 위험이 있는 Request.Path 값을 발견했습니다.]
   System.Web.HttpRequest.ValidateInputIfRequiredByConfig() +11981012
   System.Web.PipelineStepManager.ValidateHelper(HttpContext context) +52

Version information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.3429.0