I've been struggling with this issue for two weeks when upgrading to U2A build 4541947, and finally support came through with a solution.
In our case, the cause was vCenter JRE not being updated correctly.
To workaround the issue, remove the contents of the jre and then perform the upgrade.
Steps:
- Stop all vCenter services.
- Take a backup of jre folder located at C:\Program Files\VMware\vCenter Server\
- Empty the contents of jre folder except for the below files :
C:\Program Files\VMware\vCenter Server\jre\bin\libvecsjni.dll
C:\Program Files\VMware\\vCenter Server\jre\lib\ext\vmware-endpoint-certificate-store.jar
- Perform an upgrade to vCenter Server Update 2a.
