I start to get ONS1010 error on afaria

Hi

Today suddenly I get ONS1010 error from afgaria server when I try to push some session or app policy.

ONS1010: Error sending GCM message to client, "XXXXX", with Client GUID, "{YYYY}".  The request failed with GCM message: Fail-GCM Service Not Available.

I didnt check any configuration about Firewall or afaria. So what is going wrong?

BY the what should be the value of  A_CONFIGURATION_PROPERTY /C2DMServerAddress on database?

Afaria Server versipon is :  Version 7.00.6662.0 SP5