nmConnect() error WLSTException: Error occured while performing nmConnect : Cannot connect to Node

Connecting to Node Manager ...
Traceback (innermost last):
  File "<console>", line 1, in ?
  File "<iostream>", line 123, in nmConnect
  File "<iostream>", line 648, in raiseWLSTException
WLSTException: Error occured while performing nmConnect : Cannot connect to Node
Manager. : Access to domain 'my_domain' for user 'weblogic' denied
Use dumpStack() to view the full stacktrace

Solution:

if it is new installation update Weblogic credential information.