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App-V Management Server Installation Error 25120: Two likely causes

May 5, 2011
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The installation of the App-V Management Server 4.5.x on a Windows Server 2008/2008R2 occasionally fails with an “The installation programm was unable to create the required IIS virtual directory: Error 25120”

The most likely cause for this is that the “IIS Management Scripts and Tools” and/or the “IIS 6 Management Compatibility” role features are not installed. This has been discussed and confirmed several times, like at BallBlog, SystemCenterCentral, the App-V forum on Technet, Miito’s Blog and other sources (like here).

Another potential cause, that obviously is not so common, is a missing “Default Web Site” in IIS…

(more…)


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