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If the JPDA debugger fails to attach to a VM (SocketAttach, dt_socket) then nothing about the problem is reported to the user. The only thing that happends is that the usual debugging windows and buttons do not appear.
It writes the reason to the Debugger Console... Like: Attaching to localhost:8770 Connection refused. Isn't that sufficient? Perhaps issue#80396 is causing that the Debugger Console is not visible?
No more info was provided => making it a duplicate of issue #80396. *** This issue has been marked as a duplicate of 80396 ***
Verified ... and Closing all issues resolved into NetBeans 6.7 and earlier.