SCCM SUP synchronization failed

Seyed Majid Taheri 21 Reputation points


When I sync SCCM SUP, WSUS stuck in 0% and after a while I get below error

Sync failed: UssCommunicationError: WebException: Unable to connect to the remote server > System.Net.Sockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond ip address:443 at System.Net.HttpWebRequest.GetRequestStream(TransportContext& ontext). Source: Microsoft.SystemsManagementServer.


I can browse Microsoft update catalogue. I turned off windows firewall but it is no use.

how can I troubleshoot?

Microsoft Configuration Manager Updates
Microsoft Configuration Manager Updates
Microsoft Configuration Manager: An integrated solution for for managing large groups of personal computers and servers.Updates: Broadly released fixes addressing specific issue(s) or related bug(s). Updates may also include new or modified features (i.e. changing default behavior).
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Microsoft Configuration Manager
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  1. AllenLiu-MSFT 41,691 Reputation points Microsoft Vendor

    Hi, @Seyed Majid Taheri

    Thank you for posting in Microsoft Q&A forum.

    You may check if your WSUS or SUP server can resolve the site by running the following command line:


    If the answer is the right solution, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Add comment".

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  2. Pavel yannara Mirochnitchenko 12,371 Reputation points MVP

    It's a "normal" business that from time to time (during many years of usage), WSUS "breakes". There are several maintaning tasks and tricks you could do about it.

    Also, it is not a bad idea to build new WSUS from scratch, because it is quite easy thing to do :)