Are you logged onto your Windows Server when you try to start the Admin Console or are you trying from another machine on your network?
If from another machine try prefixing your ip address or hostname with https://
Thank you for your reply. I did log on the server from another machine as the server is VPS. I tried to start the admin console from Start>File Maker Server>FMS 12 Start Page rather than type in https://[host]:16000 in the browser. So just tried what you suggested and it only give me page below
Unable to connect
Firefox can't establish a connection to the server at 188.8.131.52:16000.
The site could be temporarily unavailable or too busy. Try again in a few
If you are unable to load any pages, check your computer's network
If your computer or network is protected by a firewall or proxy, make sure
that Firefox is permitted to access the Web.
It's a brand new server, so I'm suspecting if I need to config something to enable the port or something else?
FMS12 use 16001 for https:. 16000 should be used with http:.
But your error is not protocol, so check firewall on the server to open the port.