If you got the below error message for your Kerberos authentication sharepoint site using "user mode" and "Kernal mode" in IIS follow the below solution method.
“HTTP Error 401. The requested resource requires user authentication.”
Resolution:
Disable the kernel mode authentication in IIS7 by clicking Advanced Settings of the web site in IIS.
“HTTP Error 401. The requested resource requires user authentication.”
Resolution:
Disable the kernel mode authentication in IIS7 by clicking Advanced Settings of the web site in IIS.
