During the migration of vSphere 6.0 vCenter Server based on Windows to a vCenter Server Appliance 6.5 you may facing issues with EAM and certificate.
Following was logged:
2018-01-30T16:05:30.651Z | ERROR | main | VcConnection.java | 648 | Error communicating with the vCenter server.com.vmware.vim.vmomi.client.exception.SslException: com.vmware.vim.vmomi.core.exception.CertificateValidationException:Server certificate chain not verified at …
Two actions were performed and the migration successfully finished on the second attempt.
- Replacement of vCenter certificate from a SHA-1 to SHA-256 Cipher
- CleanUp of Migration data. Reduce log and events retention days in vCenter Server
- Shrink Performance Data Retention, will take some hours to release space in db
- Determining DB size and possible futher needed space for PostgreSQL described here: https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.upgrade.doc/GUID-DBC82C5C-F9ED-4E0C-B799-5AAEF962E383.html