The remote host may give an attacker information useful for future attacks
The remote .NET server has enabled verbose error reporting. By default, such reports are only accessible via localhost (127.0.0.1). If enabled, remote attackers can gain useful information for future attacks. Information displayed includes: source code, stack trace, physical path of the application, error codes, and more. In addition, there have been flaws in the way that .NET 'ValidateRequest' handles malicious inputs.
Disable verbose error reporting in .NET applications