Hello Ratnam,
Do you have the option of "Enhance log" in the selection screen of FZLR? Error EP401 is too generic and the enhanced log option has been created to provide more information on the error raised by the system. In case you do not see this option in FZLR, please check note 1301609. With the enhanced log, you should come closer to the real root cause.
Best regards,
Daniel Longoni