Restarted Watchdog service and issue got resolved.
1.Firstly we check if Watchdog Application is running.
We executed "service watchdsvc status" to check the status.
Status was running below is the output.
watchd (pid 2469) is running...
2. Then we restarted the Watchdog application using "service watchdsvc restart" command.
Post restart we can see Watchdog application came up.
[root@TXSIPINJXSM01 run]# statapp
Watchdog 9/ 9 UP
logevent 35/ 35 UP
ncsd 4/ 4 UP
postgres-db 32/ 32 UP
mgmt 319/319 UP
WebSphere 293/293 UP
CDRService 42/ 42 UP
cassandra 232/232 UP
sal-agent 59/ 59 UP
secmod 4/ 4 UP