How to troubleshoot memory issues when using the /3GB switch on Exchange Server running on Windows Server 2003

This article may interest you, if when you try to use Microsoft Office Outlook Web Access or view a Web page that is hosted on a server running Windows Server 2003, Exchange 2003, & IIS 6.0 and you receive the following error message:

The page cannot be displayed.
The page you are looking for is currently unavailable. The Web site might be experiencing technical difficulties, or you may need to adjust your browser settings.

Cannot find server or DNS Error.

This issue may occur in situations in which the /3GB switch is enabled in the Boot.ini file on the server.

Windows Server 2003 x86 systems running Exchange require the use of the /3GB switch in the boot.ini to ensure that there is plenty of address space available for the Store.exe process. The /3GB switch is used to provide more virtual memory to user mode processing. It signals the OS to use 3 GB of the 4 GB virtual address space for each user mode process, as opposed to the normal 2 GB.

Also, you will experience this error, if less than 20 megabytes (MB) of nonpaged pool memory is available on the server. When less than 20 megabytes (MB) of nonpaged pool memory is available, the Http.sys kernel mode driver stops accepting new connections.

To work around this issue, you are required to;
1. Add the EnableAggressiveMemoryUsage registry entry to the following registry subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\HTTP\Parameters

2. Set the EnableAggressiveMemoryUsage registry entry to 1. For steps on how to, visit Microsoft KB934878.

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