One of my client is not reporting to server.
From client system find the definition is updated, no issue there.
What is the reason for non reporting?
Enable sylink debugging on it. Also, did you replace the sylink file?
are you using clone system? Does client showing Online ?
it's managed client or unmanaged client ?
try this
http://www.symantec.com/business/support/index?page=content&id=TECH163349
What is the last communication time with SEPM?
What the server detail under client gui(SEP GUI - Help - Troubleshooting)
Redeploy the communication setting