FIX: Web cache files are overwritten if you connect through Visual Studio .NET to multiple Web sites that use IP addresses or host headers that reside on the same server

When Microsoft Visual Studio .NET opens a Web project, Visual Studio .NET tries to use one cache location for all URLs that appear to be the same. For example, the URLs http://localhost, http://localhost:80, http://localcomputername, and http://173.0.0.1 all locate the root folder of the Web server on the same local computer. Visual Studio .NET tries to use one cache location that has the name of the local computer for all these URLs.

The problem occurs if the computer has more than one IP address and each Web site uses a separate IP address. The reverse lookup to obtain the computer name returns the same name for each IP address. Therefore, all the Web sites that use IP addresses on the same computer share the same offline cache location. This behavior may cause data loss and other related problems.

A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Visual Studio .NET 2003 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

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.

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section of this article.

For additional information about the terminology that is used to describe Microsoft product updates, click the following article number to view the article in the Microsoft Knowledge Base: