Hi all, I have the same problem, vcenter server 6.7 on win server 2012 on esxi 6.5 platform.
service-control --stop vsphere-client
service-control --start vsphere-client
service-control --start vsphere-ui
All works perfectly.
It works for all Port related issues, thanks for suggestion.
While my error is a little different from the OP, mine was this:
"503 Service Unavailable (Failed to connect to endpoint: [N7Vmacore4Http16LocalServiceSpecE:0x000055f28255ebb0] _serverNamespace = /ui action = Allow _port = 5090)"
I checked the audit.log and it was not hugh and took up all the space. Then I went on to check the health of the VCSA by going to
Everything was fine. So I attempted to update and then I got an error saying my root password expired. Change it before retrying (something like).
Once I changed the root password of the vcsa, my web-gui came back immediately.
I wish this is some kind of notification that my root password expired. The kicker is that I was able to login as root using expired password. Once login, no message to prompt me to change password.
Hope this helps someone.