Hi,  Of course is related to certificate that has been change for custom certificate.  Please follow this KB  # vCenter Server certificate validation error in VMware vCenter Site Recovery Manager and other solutions that run on a separate systemkb.vmware.com/.../2109074 That one will redirect for thw KB that depend of your infrastructure deployement type (separate PSC or Embedded). That's one works for one of my customer.  Have a nice day.
We recently installed vCenter 6.0 in our lab. I downloaded the OMIVV OVF and deployed a brand new instance of the appliance. (I experimented with 2.3.0 in the past, but never got it working, so just threw all that out.) The connection to the vCenter went without a hitch, but the web client is showing an "Error 2000000" dialog whenever I click through the interface. When I used the first-time configuration wizard, I was able to enter all the passwords, but the list of hosts was empty, even though this vCenter has 8 attached. Without being able to select a host, I wasn't allowed to proceed through the wizard. It seems like this error has been reported in prior versions, but it's slightly different in OMIVV 3.0, so I thought I should start a new thread. It says: An unknown exception has occurred and has been logged in the extended logs.Severity: CRITICALError: 2000000Date and time: Details: An unknown exception has occurred and has been logged in the extended logs. If the issue continues, please restart your appliance. If this does not resolve the issue, please contact Dell Support.  Things I've tried: - Enable and disable the web proxy settings (no change in behavior) - Disconnected and reconnected the vCenter in the administrative interface several times - Made sure the vCenter and OMIVV appliance are on the same network, with no firewalls between - Re-registered the vCenter using the official FQDN, such that name -> numeric -> name results in the same name being returned I downloaded the support bundle and looked through the logs, but didn't see anything obvious. I'd be happy to start over and upload a clean log file or files if that would help. Any hints on where to go from here? Joseph Jackson,Computing Services,Carnegie Mellon University. 
Error 2000000 with fresh install of OMIVV 3.0 and vCenter 6.0