In case anyone else comes along, I had the same problem using Apache 2.4.6 (Ubuntu). It had to do with apache not having permission to /usr/lib/iipimage-server. I simply copied that to /usr/share/iipimage-server and adjusted the path in iipsrv.conf and the url worked.
The Data Fundamental modules provide a solid overview over the workflow with data guiding you from what data is, to how to make your data tell a story. The courses listed below should be seen as a whole, a quick overview of the elements involved in working with data.