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Algunos issues de autenticación con sitios web (Podria aplicar para sitios de SharePoint)

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1. Error message when you try to access a server locally by using its FQDN or its CNAME alias after you install Windows Server 2003 Service Pack 1: "Access denied" or "No network provider accepted the given network path"

Consider the following scenario. You install Microsoft Windows Server 2003 Service Pack 1 (SP1) on a Windows Server 2003-based computer. After you do this, you experience authentication issues when you try to access a server locally by using its fully qualified domain name (FQDN) or its CNAME alias in the following Universal Naming Convention (UNC) path:

\\servername\sharename

In this scenario, you experience one of the following symptoms:

  • You receive repeated logon windows.
  • You receive an "Access denied" error message.
  • You receive a "No network provider accepted the given network path" error message.
  • Event ID 537 is logged in the Security event log.

Note You can access the server by using its FQDN or its CNAME alias from another computer in the network other than this computer on which you installed Windows Server 2003 SP1. Additionally, you can access the server on the local computer by using the following paths:

  • \\IPaddress-of-local-computer
  • \\Netbiosnameor \\ComputerName

Check this article: https://support.microsoft.com/kb/926642

2. You receive error 401.1 when you browse a Web site that uses Integrated Authentication and is hosted on IIS 5.1 or a later version

When you use the fully qualified domain name (FQDN) or a custom host header to browse a local Web site that is hosted on a computer that is running Microsoft Internet Information Services (IIS) 5.1 or a later version, you may receive an error message that resembles the following:

HTTP 401.1 - Unauthorized: Logon Failed

This issue occurs when the Web site uses Integrated Authentication and has a name that is mapped to the local loopback address.
Note You only receive this error message if you try to browse the Web site directly on the server. If you browse the Web site from a client computer, the Web site works as expected.
Additionally, an event message that resembles the following event message is logged in the Security Event log. This event message includes some strange characters in the value for the Logon Process entry:

Event Type: Failure Audit
Event Source: Security
Event Category: Logon/Logoff
Event ID: 537
Date: Date
Time: Time
User: NT AUTHORITY\SYSTEM
Computer: Computer_Name
Description: Logon Failure:
Reason: An error occurred during logon
User Name: User_Name
Domain: Domain_Name
Logon Type: 3
Logon Process: Ðùº
Authentication Package: NTLM
Workstation Name: Computer_Name
Status code: 0xC000006D
Substatus code: 0x0
Caller User Name: -
Caller Domain: -
Caller Logon ID: -
Caller Process ID: -
Transited Services: -
Source Network Address: IP_Address
Source Port: Port_Number

Check this article: https://support.microsoft.com/kb/896861