THE FILEMAKER SERVER SAMPLE FILE IS A SECURITY THREAT. Best to close it or add security. For more details, read the whole article by Stephen Blackwell.
I have recently learned that there may be any number of FileMaker Server installations world-wide that are hosting files that open automatically without credentials challenge to the [Full Access] Privilege Set. The default-installed FileMaker Server Sample File is one of these; however, there are others.
Protect Your FileMaker Server and Files From A Vulnerability - FMForums.