Agent Inventory tab in WCC is not working

Document ID : KB000126735
Last Modified Date : 12/02/2019
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When we select 'Agent Inventory' tab, we do not see any machines listed.
However we do see a red cross sign in the 'DATASOURCES'.
When clicking on 'DATASOURCES' we get get page with following information
Status Details : WlaInternalServerErrorException: Unexpected exception connecting to Scheduler xxxxxxx
Actions : No suggestion is available
WCC 11.4 SP6 on Linux
Following error messages are shown in waae_webservices.log
2019-02-08 04:43:50,334 [AEConnMgr Monitor] ERROR - createEntityManager [EventServer_1] -> IllegalStateException encountered. Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLRecoverableException: IO Error: could not resolve the connect identifier  "AUTODB2T"
Error Code: 17002...Throwing AEConnFatalException.
The Monitor ID being used is 'autosys'.
User 'autosys' didn't had permission to read tnsnames.ora file.
Run command 'chmod a+r tnsnames.ora' .
Stop/start AE Web Server.