I was finally able to upgrade from VCSA 6.5U3 to 6.7U3 after correcting a STS issue resolved using this KB: VMware Knowledge Base
I ran into an issue where it failed due to NTP not being able to be configured, but I disabled NTP ion the VAMI and started over, which allowed the full upgrade to complete.
Once it was up, however, the browser's HTML5 loading UI kept spinning until I cleared the cache for it and reloaded the site. I tried to login in using my LDAP account, but it didn't work. I used my local account (and also the administrator account) and was able to get in. Once I got in, I noticed all the VMs appeared to be off and show as "disconnected" in the vCenter list. How do I fix this? I learned this because I was looking to find out what happened with the old VCSA appliance and which host the new one is on. Any assistance would help. Thanks.
A bonus would be that when trying to reconfigure the NTP settings that were there prior to disabling them, I get a warning message that the IP is unreachable, and all this is after rebooting the VCSA 6.7 appliance.