If you call the GetServerVariable method in the Microsoft Internet Security and Acceleration (ISA) Server Web filter, you may cause an access violation.
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To work around this problem, register the filter so that it can handle the SF_NOTIFY_PREPROC_HEADERS notification. You can leave the notification handler empty.
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Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article.
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The access violation may occur when you call GetServerVariable to retrieve a value for HTTP_ALL, RAW_HTTP, HTTP_REFFERER, and other variables. GetServerVariable can cause an access violation when it is called in any notifications, unless the filter handles SF_NOTIFY_PREPROC_HEADERS.
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