Hi Guys ..
There was a problem in connection with the Oacle Server through which the Monitor Controller wasn't responding .
I first checked the Connectivity with oracle from the Enforce Server through the command line "tnsping protect" and it was not responding.
I contacted the oracle team and they said they were experiencing a downtime. Soon as they fixed it, I restarted the services in the following sequence as suggested by Pete ..
1. Vontu Notifier
2. Vontu Manager
3. Vontu Incident Persister
4. Vontu Monitor Controller (if applicable)
5. Vontu Update (if necessary)
Thanks for your respone guys !