Updates Synchronization failure from WSUS server to SUP SCCM 2012

Hello guys, I'm setuping WSUS and SUP with SCCM 2012.

It seems that i got all updates from Microsoft and WSUS service have been configured sucesfully.

But for one reason SUP not able synchronize updates from WSUS, then I have initiated it.

 

WSUS Synchronization failed. SMS_SYNC_MANAGER COMPONENT SAID: also it showed at wsyngmgr.log

Message: UssCommunicationError: WebException: The remote name could not be resolved: 'fe2.update.microsoft.com'
at System.Net.HttpWebRequest.GetRequestStream(TransportContext& context).
 Source: Microsoft.SystemsManagementServer.SoftwareUpdatesManagement.WsusSyncAction.WSyncAction.SyncWSUS

DO this related with hotfix?

Consider the following scenario:

• You have a Windows Server Update Services (WSUS) server that is running Windows Server 2012.
• There is a required authenticated proxy running in the environment. 
• You enable the Use user credentials to connect to the proxy server setting together with the username, domain, and password provided in the WSUS console.

In this scenario, the WSUS synchronization performs successfully. However, the WSUS server cannot connect to Windows Update to download the required updates. 

Note This issue also affects the deployment of Microsoft System Center Configuration Manager and Forefront Client Services.https://support.microsoft.com/en-us/kb/2838998