Windows Server 2012 R2 support begins at 10.2.1 according to Esri. Kindly, See this page: http://resources.arcgis.com/en/help/system-requirements/10.2/index.html#//01510000007s000000 Under first table you will find this note: "*IIS 8.5 and Windows Server 2012 R2 support begins at ArcGIS 10.2.1" Thanks, Sherif Ramadan
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