Invalid credentials message when registering vCenter Server with external Platform Service Controller in vSphere 6

When vSphere 6 was released, I decided to delete my RTM version of my external Platform service Controller and vCenter Server appliances, to replace them by the GA versions.

Installing the PSC went fine, but when installing the vCenter appliance, I was not able to register it to the PSC. I kept getting the message “Invalid credentials” every time I entered the SSO administrator password. Redeployed the PSC┬áseveral time, using different passwords, but no luck registering the VCSA.

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