Thank you for posting.
I would like to gather some more information from you. Check your inbox at the top of his page.
I am having the exact same issue. at one time PHP will work and IWP will not, then IWP will work, but PHP will not.
was this every resolved?
Yes. The issue in my case was resolved by Filemaker Support who provided me with a replacement product key. It appears the issue was related to a 'bad' batch of numbers. I suggest you log a request with the Technical Support Team. If the issue is the same as mine there is nothing you can do at your end.
Thank you for your post.
When FileMaker Server 12 Advanced was first released some of the earliest license keys caused this particular issue. You should contact technical support to have your license key checked and possibly exchanged.
Knowledge base article KB 299 has more information on this issue:
If you are in North America, please contact our Technical Support department toll-free at 800-325-2747. If you are outside North America, contact the FileMaker office nearest you.