Enable a TLS 1.3 security feature for local trust anchors (obsolete)
Supported on: Microsoft Edge version 81-85, Windows 7 or later
Registry
Software\Policies\Microsoft\Edge Software\Policies\Microsoft\Edge Value name: TLS13HardeningForLocalAnchorsEnabled
Enabled: TLS13HardeningForLocalAnchorsEnabled = 1
Disabled: TLS13HardeningForLocalAnchorsEnabled = 0
Description
OBSOLETE: This policy is obsolete and doesn't work after Microsoft Edge 85. 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's backwards-compatible and doesn't 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 or don't configure this policy, Microsoft Edge enables these security protections for all connections. If you disable this policy, Microsoft Edge disables 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.