SCCM WSUS sync error – Sync Failed – WSUS server not configured

Consider the following scenario

  • The WSUS is installed on SCCM central site server.
  • The correct port is configured in Software Update Point setting.
  • No proxy server is in used.

I was getting following error in WSysncmgr.log file when initiating synchronization from Configuration Manager console.

Sync failed: WSUS server not configured. Source: CWSyncMgr::DoSync

STATMSG: ID=6703 SEV=E LEV=M SOURCE=”SMS Server” COMP=”SMS_WSUS_SYNC_MANAGER” SYS=SERVER1 SITE=BNG PID=1728 TID=3408 GMTDATE=Sat Apr 03 18:28:48.292 2010 ISTR0=”CWSyncMgr::DoSync” ISTR1=”WSUS server not configured” ISTR2=”” ISTR3=”” ISTR4=”” ISTR5=”” ISTR6=”” ISTR7=”” ISTR8=”” ISTR9=”” NUMATTRS=0

I have gone through lots of articles but nothing worked for me. I have also verified the configurations as described in the TechNet article. Everything was fine.

Later I noticed the following error in wcm.log.

System.Net.WebException: The request failed with HTTP status 401: Unauthorized.~~   at Microsoft.UpdateServices.Administration.AdminProxy.CreateUpdateServer(Object[] args)~~   at Microsoft.UpdateServices.Administration.AdminProxy.GetUpdateServer(String serverName, Boolean useSecureConnection, Int32 portNumber)~~   at Microsoft.SystemsManagementServer.WSUS.WSUSServer.ConnectToWSUSServer(String ServerName, Boolean UseSSL, Int32 PortNumber)

The same time following error was appearing in the IIS log.

2010-04-03 19:06:44 W3SVC1 POST /ApiRemoting30/WebService.asmx – 80 – Mozilla/4.0+(compatible;+MSIE+6.0;+MS+Web+Services+Client+Protocol+2.0.50727.42) 401 1 0

I searched for the error which was in IIS log and come to know about below article on

The method 1 described in the worked like a charm.

Method 1

To set the DisableLoopbackCheck registry key yourself, follow these steps:

  1. Click Start, click Run, type regedit, and then click OK.
  2. In Registry Editor, locate and then click the following registry key:


  1. Right-click Lsa, point to New, and then click DWORD Value.
  2. Type DisableLoopbackCheck, and then press ENTER.
  3. Right-click DisableLoopbackCheck, and then click Modify.
  4. In the Value data box, type 1, and then click OK.
  5. Quit Registry Editor, and then restart your computer.

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