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The user can launch a normal remote application session using the remote run configuration but not launch a remote debugging session under the debug configuration pointing the same Xserver.
This problem has been manifested when the use launches Devhub's startrdodaemon after first logging onto the Unix/Linux machine from the console as root, then launching a terminal session from the console, then launching the startrdodaemon from the terminal session.
Logon onto the Unix/Linux machine via remote ssh or from the console with a non-user id, then su to root in the terminal session, before launching the startrdodaemon.