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

  • Article

This article provides a solution to an error that occurs when you try to access a server locally by using its FQDN or its CNAME alias.

Original KB number:   926642

Note

This article contains information that shows you how to help lower security settings or how to turn off security features on a computer. You can make these changes to work around a specific problem. Before you make these changes, we recommend that you evaluate the risks that are associated with implementing this workaround in your particular environment. If you implement this workaround, take any appropriate additional steps to help protect your system.

Symptoms

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 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
  • \\Netbiosname or \\ComputerName

Cause

This problem occurs because Windows Server 2003 SP1 includes a new security feature named loopback check functionality. By default, loopback check functionality is turned on in Windows Server 2003 SP1, and the value of the DisableLoopbackCheck registry entry is set to 0 (zero).

Note

The loopback check functionality is stored in the registry subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\DisableLoopbackCheck.

Resolution

Important

This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, see How to back up and restore the registry in Windows.

Note

This workaround may make your computer or your network more vulnerable to attack by malicious users or by malicious software such as viruses. We do not recommend this workaround but are providing this information so that you can implement this workaround at your own discretion. Use this workaround at your own risk.

To resolve this problem, set the DisableStrictNameChecking registry entry to 1. Then use either of the following methods, as appropriate for your situation.

To do this, follow these steps for all the nodes on the client computer:

  1. Click Start, click Run, type regedit, and then click OK.

  2. Locate and then click the following registry subkey:
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\MSV1_0

  3. Right-click MSV1_0, point to New, and then click Multi-String Value.

  4. In the Name column, type BackConnectionHostNames, and then press ENTER.

  5. Right-click BackConnectionHostNames, and then click Modify.

  6. In the Value data box, type the CNAME or the DNS alias, that is used for the local shares on the computer, and then click OK.

    Note

    • Type each host name on a separate line.
    • If the BackConnectionHostNames registry entry exists as a REG_DWORD type, you have to delete the BackConnectionHostNames registry entry.

  7. Exit Registry Editor, and then restart the computer.

Method 2: Disable the authentication loopback check

Re-enable the behavior that exists in Windows Server 2003 by setting the DisableLoopbackCheck registry entry in the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa registry subkey to 1. To set the DisableLoopbackCheck registry entry to 1, follow these steps on the client computer:

  1. Click Start, click Run, type regedit, and then click OK.

  2. Locate and then click the following registry subkey:
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa

  3. Right-click Lsa, point to New, and then click DWORD Value.

  4. Type DisableLoopbackCheck, and then press ENTER.

  5. Right-click DisableLoopbackCheck, and then click Modify.

  6. In the Value data box, type 1, and then click OK.

  7. Exit Registry Editor.

  8. Restart the computer.

Note

You must restart the server for this change to take effect. By default, loopback check functionality is turned on in Windows Server 2003 SP1, and the DisableLoopbackCheck registry entry is set to 0 (zero). The security is reduced when you disable the authentication loopback check, and you open the Windows Server 2003 server for man-in-the-middle (MITM) attacks on NTLM.

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.

More information

After you install security update 957097, applications such as SQL Server or Internet Information Services (IIS) may fail when making local NTLM authentication requests.

For more information about how to resolve this issue, see the "Known issues with this security update" section of KB article 957097.