Oracle Developer Tools for Visual Studio

We have just installed Oracle Developer Tools 11.2.0.2.0 and are attempting to get the PL/SQL debugger functional to debug an Oracle package. We have setup the options with the correct IP address but are having trouble identifying the port number to use. We've selected what we think is an open port on the laptop. We've set breakpoints in the Oracle package - when running the local application, we are not having any luck getting the debugger to break at the breakpoints we've set. We have Symantec EndPoint Protection on the machine - I've tried disabling Symantec but stilll no luck. We've also tried the Oracle External Application Debugger - same result.

Do you have any advice as to how to determine the port number to use with the PL/SQL debugger? Is there any additional documentation you can point me to? It seems that the port number being used is the "starting port number" - does the debugger use any open port number between the starting and ending range or just the starting port number?

Thank you.