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Resolution:-
Run below Linux commands.
[root@eznag log]#service nagios stop
Delete the sock file.
[root@eznag log]#rm /usr/local/nagios/var/ndo.sock
[root@eznag log]#service nagios start
Check logs, It will stop "Still unable to connect to data sink" error logs.
After deleting ndo.sock file, it's working fine for me. But after restarting the nagios server, ndo.sock file was again created and same error occurred again. Now, I have deleted the ndo.sock file and it's working fine.
Can anyone suggest me a permanent fix of this issue?