Datastage Expired user id Log in into DS but not in Unix

Datastage Expired user id be able to log in to the DataStage server but not to the UNIX system :

SQL5005C The operation failed : DB2 Error

"SQL5005C The operation failed because the database manager failed to access either the database manager configuration file or the database configuration file." At windows machine system startup error DK®

No engine credentials were found Error Solution

No engine credentials were found on the services tier on information server engine/ Failed to connect to information server engine user name password incorrect : issue while login into datastage clients