Microsoft KB Archive/173658

= XWEB: Mailbox Access via OWA Depends on IIS Token Cache =

Article ID: 173658

Article Last Modified on 3/30/2004

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APPLIES TO


 * Microsoft Exchange Server 5.5 Standard Edition

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This article was previously published under Q173658



SUMMARY
IMPORTANT: This article contains information about editing the registry. Before you edit the registry, make sure you understand how to restore it if a problem occurs. For information about how to do this, view the "Restoring the Registry" Help topic in Regedit.exe or the "Restoring a Registry Key" Help topic in Regedt32.exe.



SYMPTOMS
After you remove the Log on Locally right for a user on a computer running Microsoft Internet Information Server (IIS), the user may still be able to log on to his or her Microsoft Exchange Server mailbox via Microsoft Outlook Web Access. This behavior is temporary and depends on the length of time that user tokens are cached on the server.



CAUSE
For performance reasons, user tokens are cached by IIS and updated at 15- minute intervals. The first time a user logs on via a Web browser, the user's user token is created. If the Log on Locally right is subsequently revoked, the user can still access the mailbox for approximately 15 minutes.



WORKAROUND
To work around this problem, do one of the following:


 * Restart all the IIS services (Gopher, FTP, and WWW). This will refresh the token cache on the IIS computer. For performance reasons, this is the preferred method if updates are infrequent. -or-


 * Change the default interval for the token cache by editing the Microsoft Windows NT registry.

WARNING: Using Registry Editor incorrectly can cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.

For information about how to edit the registry, view the "Changing Keys And Values" Help topic in Registry Editor (Regedit.exe) or the "Add and Delete Information in the Registry" and "Edit Registry Data" Help topics in Regedt32.exe. Note that you should back up the registry before you edit it.

 Start Registry Editor (Regedt32.exe).  From the HKEY_LOCAL_MACHINE subtree, go to the following subkey:      SYSTEM\CurrentControlSet\Services\InetInfo\Parameters  Select Edit. Click Add Value, and add the following:

Value Name: UserTokenTTL

Data Type: REG_DWORD

Data: (Number of seconds for token to be cached - 30 second min)

 Stop and restart all three IIS services (WWW, FTP, and Gopher).</li></ol>

For information about changing the UserTokenTTL value, refer to the following article in the Microsoft Knowledge Base:

152526 Changing the Default Interval for User Tokens in IIS

Keywords: kbusage KB173658

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