• If configuring the Lookup service or vCenter Server fails, verify that the NSX Manager and Lookup service appliances are in time sync. Use the same NTP server configurations on both NSX Manager and the Lookup service. Also verify that DNS is properly configured. For more information, see Registering NSX Manager to vCenter Server or configuring the SSO Lookup Service fails (2102041) at http://kb.vmware.com/kb/2102041.

• Verify that the OVA file is getting installed correctly. If a VMware NSX OVA file cannot be installed, an error window in the vSphere Client notes the line where the failure occurred. Also verify and validate the MD5 checksum of the downloaded OVA/OVF file.

• Verify that the time on the ESXi hosts is in sync with NSX Manager.

• VMware recommends that you schedule a backup of the NSX Manager data and configuration after installing NSX Manager. For more information, see the “Backing Up NSX Manager Data” section of the VMware NSX Administration Guide at http://pubs.vmware.com/NSX-61/topic/com.vmware.ICbase/PDF/nsx_61_admin.pdf.