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TLS13HardeningForLocalAnchorsEnabled

  • Article

Enable a TLS 1.3 security feature for local trust anchors (obsolete)

OBSOLETE: This policy is obsolete and doesn't work after Microsoft Edge version 85.

Supported versions

  • On Windows and macOS since 81, until 85

Description

This policy doesn't work because it was only intended to be a short-term mechanism to give enterprises more time to upgrade affected proxies.

This policy controls a security feature in TLS 1.3 that protects connections against downgrade attacks. It is backwards-compatible and will not affect connections to compliant TLS 1.2 servers or proxies. However, older versions of some TLS-intercepting proxies have an implementation flaw which causes them to be incompatible.

If you enable this policy or don't set it, Microsoft Edge will enable these security protections for all connections.

If you disable this policy, Microsoft Edge will disable these security protections for connections authenticated with locally-installed CA certificates. These protections are always enabled for connections authenticated with publicly-trusted CA certificates.

This policy can be used to test for any affected proxies and upgrade them. Affected proxies are expected to fail connections with an error code of ERR_TLS13_DOWNGRADE_DETECTED.

Supported features

  • Can be mandatory: Yes
  • Can be recommended: No
  • Dynamic Policy Refresh: Yes
  • Per Profile: Yes
  • Applies to a profile that is signed in with a Microsoft account: Yes

Data type

  • Boolean

Windows information and settings

Group Policy (ADMX) info

  • GP unique name: TLS13HardeningForLocalAnchorsEnabled
  • GP name: Enable a TLS 1.3 security feature for local trust anchors (obsolete)
  • GP path (Mandatory): Administrative Templates/Microsoft Edge
  • GP path (Recommended): N/A
  • GP ADMX file name: MSEdge.admx

Example value

Enabled

Registry settings

  • Path (Mandatory): SOFTWARE\Policies\Microsoft\Edge
  • Path (Recommended): N/A
  • Value name: TLS13HardeningForLocalAnchorsEnabled
  • Value type: REG_DWORD

Example registry value

0x00000001

Mac information and settings

  • Preference Key name: TLS13HardeningForLocalAnchorsEnabled
  • Example value:
<true/>

See also