Is port 443 open on the server? I had the same thing yesterday, this port was not open. It could be that there is a other service that is using this port.
Had similar problems: just copy the file from current directory and paste it directly in the database directory of FMS14.
<<just copy the file from current directory and paste it directly in the database directory of FMS14.>>
after first closing the hosted db's and stop fms
then set the appropriate file permissions and owner on the transferred files
I was a bit hasty marking this as the correct answer.
Unfortunately it has not resolved the issue in this instance.
Port 443 is open and the SSL certificate re-created and configured.
We (he) is looking at other possible services using port 443.
The URL you pasted was for FileMaker Server 13. The port numbers for FileMaker Server 14 is here:
My suggestion is to try a different port number for 443 activity.