ConfigMgr Hotfix KB15599094 NTLM Client Installation Update

 The ConfigMgr hotfix KB15599094 update prevents any attempt at NTLM authentication for client push installation when the Allow connection fallback to NTLM option is disabled. The SCCM KB15599094 NTLM client installation update replaces the previously released update KB15498768.


The client push installation account always attempts an NTLM connection to a client to retrieve WMI query results during the installation process. This NTLM connection only applies to computers in a trusted domain, and happens even if the Allow connection fallback to NTLM option is disabled in Client Push Installation Properties.

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The SCCM hotfix KB15599094 is applicable to ConfigMgr versions 2103 to 2207. The SCCM KB15599094 hotfix (NTLM Client installation update) is available in the Updates and Servicing node of the Configuration Manager console for environments that have versions 2103-2207 installed.


Last week, Microsoft released the SCCM Hotfix KB15498768 for the NTLM Connection Fallback Update. Prior to that, the KB14959905 hotfix for SCCM 2207 was released for the early update ring. Read more details about the hotfix in the NTLM client installation update for Microsoft Endpoint Configuration Manager.


The KB15599094 hotfix replaces the previously released hotfix KB15498768 for Configuration Manager. If you haven’t installed the KB15498768 yet, you can skip the hotfix installation and directly install KB15599094 hotfix.


Summary of Hotfix KB15599094

During the installation process, the client push installation account always attempts an NTLM connection to a client to retrieve WMI query results. This NTLM connection applies only to machines in a trusted domain and occurs even if the Allow connection fallback to NTLM option in Client Push Installation Properties is disabled.


Environments utilizing Configuration Manager current branch versions prior to 2103 are urged to upgrade to a later supported version which is SCCM 2207. Administrators can also disable the usage of automatic and manual client push installation methods to eliminate the risk of exposure to both this and the KB15498768 issue.


Install ConfigMgr Hotfix KB15599094 NTLM Client Installation Update

Use the following steps to install the ConfigMgr Hotfix KB15599094 – NTLM Client Installation Update:

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Launch the Microsoft Endpoint Configuration Manager console.

Browse to Administration\Overview\Updates and Servicing.

Right-click on Configuration Manager 2207 Hotfix KB15599094 and select Install Update Pack.


The Configuration Manager 2207 Hotfix KB15599094 includes only site server updates. For prerequisite warnings, you can enable the option “Ignore any prerequisite check warnings and install the update” on your production server running SCCM 2207. Click Next.


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