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Hi guys, I'm currently having a problem installing SCCM CB (1511) in my lab. I already did all the prerequisites steps successfully. When I run the SCCM installation it gives me an error right before the prerequsite check step. I did try the isntallation on a few server in my lab but always get the same error. In my lab I got a full copy of the actual production SCCM 2012 R2 and still get the same error message when I ran it on those servers. I did run the prerequisite checker offline and everything is fine too. Here's the error I get : Unknown error (0x80005000). This error occurs between "Setting Summary" and "Prerequisite Check" In the "ConfigMgrSetup.log" there's no error In the "ConfigMgrSetupWizard.log" there is an error : ConfigMgrSetupWizard Error: 1 Exception message [unknown error (0x80005000)], Exception details: [system.Runtime.InteropServices.COMException (0x80005000): Unknown error (0x80005000) at System.DirectoryServices.DirectoryEntry.Bind(Boolean throwlfFail) Here's the lab specs : Windows Server 2012 R2 Virtual on VMware vSphere AD Domain is 2008R2 Rights : Domain Admin Schema already extended since SCCM 2012 R2 is in place and working Is there someone who come accross this issue ? Thanks in advance for your help.