Block Insecure Protocols

Supported on: At least Windows Server 2008 R2 or Windows 7

Registry

HKCU software\policies\microsoft\office\16.0\common\fileio

Value name: blockinsecureprotocols

Enabled: blockinsecureprotocols = 1

Disabled: blockinsecureprotocols = 0

Description

This policy setting allows you to control which protocols can be used when opening documents in Microsoft 365 apps. If you enable this policy setting, non-HTTPS links will be blocked when opening documents in Microsoft 365 apps. If you disable this policy setting, all protocols and links will be allowed when opening documents in Microsoft 365 apps. If you don't configure this policy setting, all protocols and links will be allowed when opening documents in Microsoft 365 apps.