SEP client can't downloadin anitivirus and antispyware definitions from SEP Server

SEP version : 11.0.6300.803

I face problem on sep client around 100 client can't downloading antivirus and antispyware definitions as below figure.

I deleted definition and distribute on SEP server and try to download and distribute againd but it doesn't work. 

I created new policy and installation package it still can't work.

I checked client communication with SEPM follwing below link can communication well.

http://www.symantec.com/business/support/index?page=content&id=TECH95789

Can everyone help me to investigate and recomment?

remark : I have 2 SEPM server as the same version and when i try to setup SEP package on another server it can download antivirus and antispyware by normally.