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Authentication errors when connecting to SharePoint or OneDrive from Windows 7 or 8


As previously communicated in the Microsoft 365 Admin Center (for example, communication MC240160 in February 2021), we're moving all online services to Transport Layer Security (TLS) 1.2+. This change started on October 15, 2020. Support for TLS 1.2+ will continue to be added to all Microsoft 365 environments for the next several months. If you haven't taken steps to prepare for this change, your connectivity to Microsoft 365 might be affected.

Make sure that you carefully review information about TLS deprecation. That change might also cause this error.


When you access a Microsoft SharePoint or OneDrive website from Windows 8 or Windows 7 Service Pack 1 (SP1), you receive one of the following error messages:

Error code: 0x8004de40

The remote server returned an error: (400) Bad Request

The underlying connection was closed