A small problem I just experienced when installing ColdFusion 8 on my mac and choosing to integrate it with the Apache install that ships with OS X.

ColdFusion would not serve any requests and reported:

JRun will not accept request. Check JRun web server configuration and JRun mappings on JRun server

A closer look at the Apache error log revealed:

could not open serverstore /Applications/ColdFusion8/runtime/lib/wsconfig/1/jrunserver.store

It turns out that there was no jrunserver.store file. The simple solution is to create the file and add:

proxyservers=127.0.0.1:51011