The underlying connection was closed error when the service connection tool downloads the file

This article helps you fix an issue in which you encounter an AdminUIContentDownload error when you use ServiceConnectionTool.exe to download updates in Configuration Manager.

Original product version:   Configuration Manager (current branch)
Original KB number:   4561945


When you use the service connection tool (ServiceConnectionTool.exe) to download and import updates in Configuration Manager current branch (version 2002 and earlier versions), the following error entry is logged in ServiceConnectionTool.log:

ERROR:AdminUIContentDownloadDownload:DownloadManifestCab exception: The underlying connection was closed: An unexpected error occurred on a send.. There may be an issue with internet connection or the download link


This issue occurs because TLS 1.2 isn't enabled. TLS 1.2 is required to download the .cab file.


To work around the issue, use either of the following methods:

  • Manually download the file from, and save the file to the folder that's specified by the -updatepackdest parameter when you run th serviceconnectiontool.exe command. Then, rename the file to ConfigMgr.AdminUIContent.auc.

  • On the computer that runs the service connection tool, set the following registry values, and then restart the computer:

    Subkey: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\v4.0.30319


    • SystemDefaultTlsVersions = DWORD:00000001
    • SchUseStrongCrypto = DWORD:00000001