Thank you for your post.
I am unable to replicate the issue on my MacBook Pro running macOS Sierra 10.12.3.
After rebooting, launch a different browser other than Opera (Safari, Chrome) and go to:
You should get the FileMaker Server Start Page. Then click "Start Admin Console".
What services are up and running?
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sudo /Library/FileMaker\ Server/HTTPServer/bin/httpdctl start
This worked for me. I stopped the Mac Webserver and ran the command from the Terminal app and was able to get my webserver in FileMaker back up and running. Thanks for your help. I did not have to reinstall FileMaker.