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[nb36-rc1] When an user changes a server instance username and password after the server has been started at least once, these properties are not taken into account. To reproduce: 1) start a server instance (which appropriate manager username/password properties) 2) stop the server 3) change the username or password 4) start the server again => the server is started, all manager's operations are allowed even if you specified a not privileged user name or incorrect password.
this must have been fixed long time ago