Thank you for the post.
The solution would be to use a dedicate machine for FileMaker Server 13. "For best performance, run FileMaker Server on a dedicated machine reserved for use as a database server." See more on page 10 of the FileMaker Sever 13 Getting Started Guide:
"Avoid using the machine running FileMaker Server as an email, print, or network file server." The computer running FileMaker Server should be used only as a FileMaker Server. If a process or application is using a port or ports that FileMaker Server 13 needs, then removing that process or application will remove the conflict.