Application gateways should have SSL min protocol version set to TLSv1.2 or higher

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Description

TLS 1.0 and 1.1 are deprecated protocols with known vulnerabilities. Application gateways should enforce TLS 1.2 or higher as the minimum protocol version. Azure supports three SSL policy types: Predefined (where the TLS version is determined by the policy name), Custom, and CustomV2. For Custom and CustomV2 policies, TLS enforcement is controlled via the min_protocol_version field.

Remediation

Update the Application Gateway SSL policy to enforce TLS 1.2 or higher. Select a Predefined policy that enforces TLS 1.2 or higher, or configure a Custom/CustomV2 policy with min_protocol_version set to TLS 1.2 or higher. For details on available policies, see Application Gateway SSL policy overview.