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Error message when you try to install the ASP.NET feature in IIS 7.0: "An error has occurred"
Article ID: 929772 - View products that this article applies to.
In Microsoft Internet Information Services 7.0 (IIS 7.0), you may receive an error message that resembles the following when you try to install the Microsoft ASP.NET feature:
Additionally, the following information is logged in the IIS 7.0 installation log file (Iis7.log): Note The Iis7.log file is located in the folder where Microsoft Windows is installed.
An error has occurred. Not all of the features were successfully changed.
This issue occurs because a duplicate Internet Server API (ISAPI) filter is detected when you try to install the ASP.NET feature.
To resolve this issue, follow these steps:
Steps to reproduce the behavior