A couple of things to consider in Production. Often Production Servers have more than one application server and may have load balancing configured. When you set a session breakpoint it is for that application server. When you run the production application you might be getting load balanced to another application server. Try and launch the application directly from the appliation server you are setting the breakpoint on. Sometimes that can be difficult if the hostname_full parameter has been configured with the message server hostname. Even starting the WDA application from the application server may cause it to still become load balanaced. You might need to manually adjust the URL.
Also consider that perhaps you dont' have authorization for external debugging in your production system. You might want to talk to your security administrators to make sure.
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