Unable to get updates to clients from from symentec server
i have installed symentec end point protection SBE 12.0.1001.95 Antivirus on Windows Server 2008 64 bit Standard Edition
the problem is when i install antivirus on the client machine its install successfully after installing when i do update policy it updates till
may 20 2012 r9 after that its not getting updated and a small round yellow mark appears on symentec icon by saying defination out of date.
mean while when i check server it is fully updated.
This problem i am facing from past one month earlier there was no problem
and i have attached the file of the error message
please provide me the solution for this