SCCM CMG internet clients download failed for content error 0x80070057

alid01 It sounds like your intranet clients are supposed to be using the two on-premise distribution points through the default boundary group. To enable this, you probably set the Fallback time for distribution points in the Default Behavior tab for the Default-Site-Boundary-Group to 0 (zero) minutes. This would explain why the distribution points in the default boundary group are offered to internet clients as well.

If that's the case, you could remove the two on-premise distribution points from the default boundary group, and instead add them to a custom boundary group containing all of your intranet boundaries. As an alternative, you could create a specific relationship from your internet boundary group to the Default-Site-Boundary-Group and enable the "Never fallback" option for distribution points in that relationship. Be careful though: this is based on assumptions, and your actual configuration might be different. For more information, see Configure boundary groups for Configuration Manager: Fallback .