Hello,
I would appreciate if you could please upload us the sylink.log from the client machines which are not reporting to the SEPM.
How to enable Sylink debugging for the Symantec Endpoint Protection 11.x and 12.1 client in the Windows Registry
http://www.symantec.com/docs/TECH104758
In case, you are running SEPM 12.1 RU2 and above, check this Article:
Restoring client-server communications with Communication Update Package Deployment
http://www.symantec.com/docs/HOWTO81109
You could also use the SylinkReplacer Utility for SEP 12.1.
SylinkReplacer for SEP 12.1 is only available with Symantec Technical Support Team.
Create a case with with Symantec Technical Support Team.
How to create a new case in MySupport http://www.symantec.com/docs/TECH58873
Phone numbers to contact Tech Support:-
Regional Support Telephone Numbers:
- United States: https://support.broadcom.com (407-357-7600 from outside the United States)
- Australia: 1300 365510 (+61 2 8220 7111 from outside Australia)
- United Kingdom: +44 (0) 870 606 6000
Hope that helps!!