Some antivirus programs may cause Web applications to restart unexpectedly. If your computer is experiencing this problem, you may notice the following:

•	The Web applications or Application Domains (AppDomains) restart, although you have not changed any critical files (such as the Web.config file, the Global.asax file, the Machine.config file, or any files in the Bin folder). (Each Web application is assigned to a single AppDomain.)
•	The AppDomain restarts cause the value of the ASP.NET Application Restarts Performance Monitor counter to increase.
•	The AppDomain restarts cause sessions to restart if you are using the InProc session state mode.
•	The AppDomain restarts may cause slow performance.

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Some antivirus programs change the archive bit of a file. Others change the creation date or the time that the file was last written to. If any of these changes occur on one of the critical files or folders, ASP.NET detects the change, and then restarts the AppDomain.

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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: 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.

	           Date         Time   Version       Size       File name
		   -----------------------------------------------------------------------
		   07-Jun-2003  00:44  1.1.4322.910    253,952  Aspnet_isapi.dll
		   07-Jun-2003  00:44  1.1.4322.910     20,480  Aspnet_regiis.exe
		   07-Jun-2003  00:44  1.1.4322.910     32,768  Aspnet_wp.exe
		   15-May-2003  23:49                   33,522  Installpersistsqlstate.sql
		   15-May-2003  23:49                   34,150  Installsqlstate.sql
		   07-Jun-2003  12:52  1.1.4322.910  1,216,512  System.dll
		   07-Jun-2003  00:39                   14,472  Webuivalidation.js
		   07-Jun-2003  12:52  1.1.4322.910  1,249,280  System.Web.dll

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Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.

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This hotfix has been tested for use with the following antivirus programs:

•	ETrust
•	McAfee
•	Symantec\Norton Note Symantec has a fix available for on-demand scanning. This fix enables on-demand scanning to run without causing an AppDomain restart. Real-time scanning does not cause this problem.

The third-party products that are discussed in this article are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.

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