Concurrent Services are not getting up

Sometimes after EBS R12 cloning, the Concurrent Services did not get up
ps -ef | grep FND |wc -l
0

Findings:
Login to frontend
Click to OAM ----> Concurrent Manager
Check the hostname
If it is showing hostname of Production Then,

Solution:
While cloning run exec FND_CONC_CLONE.TARGET_CLEAN instead of exec FND_CONC_CLONE.SETUP_CLEAN.
Sometimes SETUP_CLEAN do not properly clean the nodes name.Although it shows nodes count 0 in fnd_nodes.
So its better to run FND_CONC_CLONE.TARGET_CLEAN.