Microsoft KB Archive/248037

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"HTTP Error 500-13 - Server too busy" error message when you connect to a computer that is running IIS 4.0 or IIS 5.0

Article ID: 248037

Article Last Modified on 9/30/2007


  • Microsoft Internet Information Services 5.0
  • Microsoft Internet Information Server 4.0

This article was previously published under Q248037

We strongly recommend that all users upgrade to Microsoft Internet Information Services (IIS) version 6.0 running on Microsoft Windows Server 2003. IIS 6.0 significantly increases Web infrastructure security. For more information about IIS security-related topics, visit the following Microsoft Web site:


When you connect to a computer running Internet Information Server (IIS) 4.0 or Internet Information Services (IIS) 5.0, you may receive the following error message:

HTTP Error 500-13 - Server too busy

The request cannot be processed at this time. The amount of traffic exceeds the Web site's configured capacity.


The server cannot satisfy the request due to the internet traffic or processor utilization that the server is experiencing.


Several steps can be taken to optimize server performance. Please see the list of references in the "More Information" section for additional information.

You may want to consider multiple servers to service the volume of traffic and use Windows Load Balancing to distribute the load.


For additional information about performance tuning, click the following article number to view the article in the Microsoft Knowledge Base:

235461 Enhancing performance in Internet Information Server 4.0

Tuning Internet Information Server Performance

For tuning tips on IIS 4.0 (many of which are still valid), download the self-extracting document "Tuning Parameters for High-Volume Sites" from the following Microsoft Web site:

For ASP tips and tricks for high-volume servers, visit the following Microsoft Developer Network (MSDN) Web sites::

Additional query words: iis 5 500-13 performance tuning

Keywords: kbprb kbprod2web KB248037