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I got this issue with my iSCSI disk provided by Microsoft Windows Server. I am able to access the iSCSI datastore, all of my Virtual Machines are operational with any issue, my iSCSI datastore is showing as inactive but its status is showing normal. It happend after I had removed iSCSI targets from Windows but and added new target after some time. What I did; Rescanned all datastore multiple times --- no luck restarted management services from SSH of all ESXi hosts with command  $ services.sh restart --- no luck Removed and re-added targets from iSCSI (Windows) Side --- no luck Removed few VMs which were in inaccessible state and then rescanned datastore --- no luck Finally restarted each ESXi host at a time, it solved the problem.

You may Get  clock skew erro r while connecting from Cisco Access Control Server (ACS 5.x) to Microsoft Active Directory selecting it as an External Database. The Clock time should be the same on both Cisco ACS server and Microsoft Active Directory Server to avoid this error. You can configure the ACS Server with three command so that the Clock is matching with the Active Directory Server. Command are; 1. clock set Nov 04 05:05:05 2013 2. clock timezone Asia/Karachi 3. ntp server 10.0.0.1 Once set these command Save the configuration in ACS server, reload the server and try connecting external database again.

This is the detail of the error message in adprep log file Adprep failed to verify whether schema master has completed a replication cycle after last reboot. [Status/Consequence] The schema is not upgraded. [User Action] Check the log file ADPrep.log in the C:\Windows\debug\adprep\logs\20130613165022-test directory for possible cause of failure. [2013/06/13:16:50:22.392] Adprep encountered an LDAP error. Error code: 0xc. Server extended error code: 0x20ae, Server error message: 000020AE: SvcErr: DSID-03210384, problem 5010 (UNAVAIL_EXTENSION), data 8610 My domain scenario is that I have main domain controller on Windows Server 2008 R2 (DC1) and a backup domain controller on Windows Server 2008 (DC2), I am upgrading my company’s domain controller to server 2012 and for this i installed windows server 2012 on one of my machine in a Hyper-V role and wanted to make it as another backup domain controller before making further up gradation. But it was failing on pre-requisite checks wi