I am running ColdFusion Builder 3 (Express Edition) to connect to a locally running ColdFusion 9 server (Windows machine).
When I configure RDS on CF Builder and click Test Connection , everything is fine.
But when I click Test Debugger , I get the following error:
Failed to initialize class coldfusion.log.CFLogs
Is the problem that CF Builder 3 is trying to access the CF 9 server?
According to this forum forum forum, they solved the same problem by changing the port setting in ColdFusion Builder to a standard HTTP port (usually 80).
I also found this article detailing steps for setting up ColdFusion debugging using Eclipse, as well as a port assigned to 80.
UPDATE:
Read this practical article from Charlie Areart. Although it references older versions, I think the same steps still apply, and it mentions specific things that must be enabled on your ColdFusion server in order for it to work. Hope this helps.
Configuring ColdFusion Builder step-by-step debugging
And here is a video tutorial from an Adobe blog that will also help you in this process.
Learn how to debug ColdFusion applications with ColdFusion Builder