The title is the problem which resulted from trying to fix a problem before this error occurred, here is the history:
I installed FileMaker server 12 onto a server that has two network adapters, one at 192.168.16.15 and the other at 192.168.16.45.
The IIS webserver is at 192.168.16.15 and not at x.x.x.45, I tried configuring the webservices in FileMaker with localhost, the actual ip address and the machine name, yet despite this, it insisted on installing into IIS for web publishing at the IP address of 192.168.16.45 ( the secondary network card ).
To force it to use the correct IP address I used an option to limit which IP address to use ( I can't remember the edit option / screen and can't obviously get back in! )
Anyway, It told me I had to restart FileMaker server and now I have the error message in the Admin Console when I try and reload the server.
I'm completely stuck because I can't get back into the software :-S