Oracle Message PGA-21200 - connect to Oracle Server as string failed

ERROR	connect to Oracle Server as string failed
CAUSE	The RRM was unable to connect as user to the Oracle server where its LU6.2 log information is stored. An Oracle server message will follow this message.
ACTION	Ensure that the Oracle server and its TNS listener are both operational. Also check the LOG_DB, LOG_USER, and LOG_PASS parameters in the RRM init file and ensure that they specify the correct database string, userid, and password, respectively.