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Set the Forms-Based Authentication Private Computer Cookie Time-Out Value

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Applies to: Exchange Server 2010 SP3, Exchange Server 2010 SP2

You can set the cookie time-out values for private computers by using forms-based authentication on an Outlook Web App virtual directory in Microsoft Exchange Server 2010. Private computers are also known as trusted computers.

Warning

It's important that you warn users of the risks associated with selecting the This is a private computer option. A user should select This is a private computer only if the user is the sole operator of the computer and the computer complies with your organization's security policies.

Looking for other management tasks related to forms-based authentication? Check out Setting Up Forms-Based Authentication for Outlook Web App.

Prerequisites

The Outlook Web App virtual directory is configured to use forms-based authentication.

Warning

Incorrectly editing the registry can cause serious problems that may require you to reinstall your operating system. Problems resulting from editing the registry incorrectly may not be able to be resolved. Before editing the registry, back up any valuable data.

You need to be assigned permissions before you can perform this procedure. To see what permissions you need, see the "Registry Editor" entry in the Client Access Permissions topic.

  1. On the Exchange Client Access server, sign in by using your Exchange administrator account, and then start Registry Editor (regedit).

  2. In Registry Editor, locate the following registry key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchange OWA

  3. On the Edit menu, point to New, and then click DWORD Value. In the details pane, name the new value PrivateTimeout.

  4. Right-click the PrivateTimeout DWORD value, and then click Modify.

  5. In Edit DWORD Value, under Base, click Decimal.

  6. In the Value Data box, type a value in minutes between 1 and 43,200 for a maximum of 30 days. Click OK.

    Note

    You must restart the Forms-Based Authentication service for the changes to take effect. On the Client Access server, go to Start > Administrative Tools > Services. In Services, right-click Microsoft Exchange Forms-Based Authentication service and click Restart.

You need to be assigned permissions before you can perform this procedure. To see what permissions you need, see the "Outlook Web App virtual directories" entry in the Client Access Permissions topic.

This example sets the private computer cookie time-out value.

set-ItemProperty 'HKLM:\SYSTEM\CurrentControlSet\Services\MSExchange OWA' -name PrivateTimeout -value <amount of time> -type dword

Note

You must restart the Forms-Based Authentication service for the changes to take effect. On the Client Access server, go to Start > Administrative Tools > Services. In Services, right-click Microsoft Exchange Forms-Based Authentication service and click Restart.

This example lets you view the private computer cookie time-out value.

get-ItemProperty 'HKLM:\SYSTEM\CurrentControlSet\Services\MSExchange OWA' -name PrivateTimeout

Other Tasks

After you set the cookie time-out values for private computers using forms-based authentication, you may also want to:

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