Two services conflict with FileMaker Server 17 on ports 80 and 443:
- IIS Web Site for Windows Server Essentials Connect (i.e.
https://YOURSERVER/remote) is bound on
- BranchCache (part of Windows Server) is bound on
*:80(and somehow is able to share that port with IIS).
- Move Windows Server Essentials to a different set of ports (temporarily), via IIS Admin Console.
- Stop BranchCache (temporarily)
The goal is to trick the FileMaker Server installer into proceeding with install, so we can then tweak the IIS config AFTER install.