HOW TO: Modify the AuthPersistence Metabase Entry Controls When Clients Are Authenticated

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We strongly recommend that all users upgrade to Microsoft Internet Information Services (IIS) version 7.0 running on Microsoft Windows Server 2008. IIS 7.0 significantly increases Web infrastructure security. For more information about IIS security-related topics, visit the following Microsoft Web site:For more information about IIS 7.0, visit the following Microsoft Web site:
IMPORTANT: This article contains information about editing the metabase. Before you edit the metabase, verify that you have a backup copy that you can restore if a problem occurs. For information about how to do this, see the "Configuration Backup/Restore" Help topic in Microsoft Management Console (MMC).


This step-by-step article describes how to modify the metabase to control authentication persistence.

HTTP Keep-Alives allow Web browsers to reuse the same TCP connection to make multiple requests to a Web server such as Internet Information Server (IIS). If a Web server requires authentication such as Basic, Kerberos, or Microsoft Windows NT Challenge/Response, a Web browser is challenged for authentication by the server. The Web browser must send authentication information to the Web server. After the Web browser is authenticated by the server, the Web browser can only be challenged again by the server when it opens a new connection from a different TCP port. This is known as authentication persistence.

Authentication persistence can be controlled by the metabase property AuthPersistence. Microsoft recommends that you set this property by setting the corresponding subflag to TRUE, which automatically sets a binary value for AuthPersistence.

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Description of Authentication Persistence Settings

  • AuthPersistSingleRequest: If this metabase property is set to TRUE, authentication persists only for a single HTTP request.
  • AuthPersistSingleRequestIfProxy: If this metabase property is set to TRUE, authentication persists only for a single HTTP request if it is a proxy request and the request is not handled by Microsoft Proxy Server (that is, if Proxy Server and IIS are running on the local computer, and the request is targeted to a remote server.)
  • AuthPersistSingleRequestAlwaysIfProxy: If this metabase property is set to TRUE, authentication is valid for a single HTTP request if the request is by proxy.NOTE: Only one subflag of AuthPersistence can be TRUE at one time. By default, AuthPersistSingleRequestIfProxy is set to TRUE. The metabase entries that are turned on by default do not appear on enumeration of the metabase until you specifically set them.
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Modify the Metabase

WARNING: If you edit the metabase incorrectly, you can cause serious problems that may require you to reinstall any product that uses the metabase. Microsoft cannot guarantee that problems that result if you incorrectly edit the metabase can be solved. Edit the metabase at your own risk.

NOTE: Always back up the metabase before you edit it.

For additional information about how to back up the metabase, click the article numbers below to view the articles in the Microsoft Knowledge Base:
300675 HOW TO: Create a Metabase Backup by Using Internet Information Server 4.0 in Windows NT
300672 HOW TO: Create a Metabase Backup in IIS 5
To modify the metabase properties as described in this article, run the following at a command prompt:
NOTE: Adsutil.vbs is generally located at Winnt\System32\Inetsrv\Adminsamples (for IIS 4.0) or at Inetpub\Adminscripts (for IIS 5.0).

NOTE: Setting AuthPersistence values can cause the IIS server performance to decrease. Based on the subflag set, the IIS server may challenge each Web browser for each HTTP request that is made to the server. This also may require the IIS server to make authentication requests to the domain controller for each domain account making a new HTTP request.

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For more information about authentication persistence, see the IIS 5.0 online documentation at the following Microsoft Web site:
Getting Started with Internet Information Services (IIS)
For more information, visit the following Microsoft Developer Network (MSDN) Web site:back to the top
iis 5

Article ID: 318863 - Last Review: 12/07/2015 09:08:44 - Revision: 4.2

Microsoft Internet Information Services 5.0, Microsoft Internet Information Server 4.0

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