Hi Lalitha,
-- Please check if all the services are running fine when you face this issue.
--Check with the system resources, if any of system resource is exhausting.
-- Have you increased the value of concurrent jobs?
-- Check with the ports which being used in this communication, if this is clustered environment.
-- Is this a clustered environment?
-- Check if there is enough space on the BO installation drive.
-- You will need to figure out why does it show File repository server down.
-- Try creating new job server.
-- Refer to the following scn links
https://scn.sap.com/thread/1677881
http://scn.sap.com/thread/3581294
http://scn.sap.com/thread/2138160
https://scn.sap.com/thread/1196083
The links does not show exactly same cause.
Regards,
Ashwini