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500 Error when running PHP on IIS

Attempting to get PHP 5.6 running on Windows Server 2012 (IIS 8) I started receiving generic 500 errors.

I enabled Failed Request tracing and reviewed the trace.

The trace revealed this error:

ModuleName FastCgiModule
ErrorCode The extended attributes are inconsistent. (0xff)

The problem was a missing Visual C++ runtime.

Ensure the appropriate VC++ runtime is installed for the version of PHP running.

In this case I needed the VC++ 11 runtime.

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