Policy

Block Insecure Protocols

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.

Policy
Pack Microsoft Office
Category Microsoft Office 2016 / Security Settings
Policy ID 8144b058be1d
Internal name L_BlockInsecureProtocols

Registry

Copy registry mappings

HKCU\software\policies\microsoft\office\16.0\common\fileio\blockinsecureprotocols (enabled) = 1
HKCU\software\policies\microsoft\office\16.0\common\fileio\blockinsecureprotocols (disabled) = 0

Policy notes

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.

Related policies

ActiveX Control InitializationAllow Basic Authentication prompts from network proxiesAllow file extensions for OLE embeddingAllow root or intermediate certificates as VBA trusted publishersAllow specified hosts to show Basic Authentication prompts to Office appsAllow VBA to load typelib references by path from untrusted intranet locationsAutomation Security