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Performance Wizard Error

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When attempting to use the performance wizard against an ASP.NET project you receive an error like the following:

Launch Error: The web site could not be configured correctly; getting ASP.NET process information failed. Requesting 'https://localhost:[portnumber]/[SiteName]/VSEnterpriseHelper.axd' returned an error: The information returned is invalid.

PRF0017: Can't launch server for 'C:\...\src\'.

This is because the performance capability of Visual Studio 2005 isn't compatible with web sites that use forms authentication. You can visit the site from outside the project, but pointing it at the project won't work directly if you are using forms authentication.