Saposcol Is Not Running (Troubleshoot)

1) login as <sid>adm
2) check if your saposcol is running at unix level
ps -ef | grep saposcol
3) go to /sapmnt/NPD/exe
Check if saposcol file is existing
Check the owner and the permission of the file
To start SAPOSCOL with the command saposcol (or saposcol -l). 
Saposcol can run independent of the SAP system, so you can try to start it individually using:
Try to start saposcol with command saposcol -l
You can know status of the saposcol by saposcol -s and stop it by saposcol -k
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Try to check, if you have cleaned up Share memory present in /usr/sap/tmp/dev_coll & try to get latest patch of SAPOSCOL.
Shared memory cleanup can be done as follows:

1) Login with the user <sid>adm and perform these steps
saposcol -d
Collector > clean
Collector > quit
saposcol -k to stop the collector.
Before restarting
saposcol -d
Collector > leave (You should get a message Shared memory deleted)
Collector > quit
cd /usr/sap/tmp
mv coll.put coll.put.sav
cd
saposcol
"coll.put" ,if this file contains the old shared memory and should be deleted in order to get a clean start. Please look at the SAP Note 548699 and follow point 7 very carefully:

If you are unsuccessful in clearing shared memory, please try the following commands to clear the shared memory:
2)
$ saposcol -kc
$ saposcol -f

If this doesn't work, then try:
3)
cleanipc 99 remove on the O/S level (Check note #548699 first)

4) If not you have to do a OS level restart to fix the issue.
Also check if new saposcol can be applied as per Note 19227

THANK YOU