System.Web.HttpException: A potentially dangerous Request.Path value was detected from the client (?).

Question

User379720387 posted

Several times a day I am getting this error message. Is this something to be concerned about? 

C:\inetpub\site\wwwroot\signalr\ping?_=15452020200281036

System.Web.HttpException (0x80004005): A potentially dangerous Request.Path value was detected from the client (?).   at System.Web.HttpRequest.ValidateInputIfRequiredByConfig()   at System.Web.HttpApplication.PipelineStepManager.ValidateHelper(HttpContext context)

Answer 1

User61956409 posted

Hi wavemaster,

You can try to add and assign a comma-separated string of characters to the requestPathInvalidCharacters attribute, and set the relaxedUrlToFileSystemMapping property to true.

https://docs.microsoft.com/en-us/dotnet/api/system.web.configuration.httpruntimesection.requestpathinvalidcharacters?view=netframework-4.7.2

https://docs.microsoft.com/en-us/dotnet/api/system.web.configuration.httpruntimesection.relaxedurltofilesystemmapping?view=netframework-4.7.2 

With Regards,

Fei Han