Thank you for your post.
For a secure SSL connection, the default port is 443, so make sure this is open. Also, make sure you have a certificate for your web server. Also, Instant Web Publishing is not available with FileMaker Server; only with FileMaker Server Advanced. You cannot use FileMaker Pro, since it has its own web server while FileMaker Server Advanced would use Apache.
For more information about necessary ports, see Knowledge Base Article #6427 at:
For more information about SSL Certificates, see Knowledge Base Article #6496 at: