SCCM 2012 R2 Doesn't deploy updates

When I try to deploy Windows Updates by SCCM 2012 R2, on Monitoring > Deployment Status the target computers still in the Unknown tab.

I have this WSUS error “ System.Net.WebException: The request failed with HTTP status 503: Service Unavailable.~~   at Microsoft.UpdateServices.Administration.AdminProxy.CreateUpdateServer(Object[] args)~~   at Microsoft.UpdateServices.Administration.AdminProxy.GetUpdateServer()~~   at Microsoft.SystemsManagementServer.WSUS.WSUSServer.ConnectToWSUSServer(String ServerName, Boolean UseSSL, Int32 PortNumber)”.  I try run iexplore.exe > Go to internet options > Go to conections > 
Go to LAN settings > Uncheck all boxes. But the problem still.
Any ideas?
Oscar PowersAsked:
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Oscar PowersAuthor Commented:
I find this website, I make a change on the private memory limit of Application Pools of IIS Manager.

Now my server is synchronizing the updates, but I need to wait if deployment works or not.

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Oscar PowersAuthor Commented:
The change on the private memory limit of Application Pools IIS Manager fix the problem, my server is deploying the Windows updates now.
Oscar PowersAuthor Commented:
The SCCM 2012 R2 server stop to synchronize  and deploy Windows updates.  After I increase the private memory limit of Application Pools of IISIIS Manager, the server start to work normally.
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