I have 2 machine deployment in FileMaker 15 and is accessible externally with the public domain names. I have upgraded our Windows server to 16 with the latest 16.0.4 update. The database works and SSL certificate have been installed in both master and worker machines. When I use the local server name, the worker is successfully added. The worker can be seen in the admin console. FM databases work within the local network. However, when it comes to adding the worker machine using a FQDN, I get a message "Connection failed". Firewall's been turned off and I'm stuck. Any help is appreciated.