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Microsoft Internet Information Services (IIS) 6.0 does not return an HTTP 503 error when the number of requests is greater than the RequestQueueLimit value that you define in the configuration settings for ASP.NET.
This is a design change from ASP.NET 1.0 to ASP.NET 1.1. In ASP.NET 1.0, IIS returns an HTTP 503 error and rejects each request that is over the limit of the RequestQueueLimit value:
Note This is a performance issue that occurs when you stress test IIS 6.0. Also, this fix maintains compatibility with ASP.NET 1.0. You can view the following PerfMon objects to determine when the number of requests is greater than the limit:
How to Obtain the Hotfix
This issue is fixed in the June 2003 ASP.NET Hotfix Package 1.1. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
821156 INFO: ASP.NET 1.1 June 2003 Hotfix Rollup Package
You cannot obtain this fix individually. You must install the rollup.
Note When you request this hotfix, you receive the rollup. The English version of this hotfix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.