 work by inspecting the initial bytes of a connection to determine the protocol, which is incompatible with server first protocols.</p><p>In order to support these cases, follow the <a href=/v1.21/docs/ops/configuration/traffic-management/protocol-selection/#explicit-protocol-selection>Explicit protocol selection</a> steps to declare the protocol of the application as <code>TCP</code>.</p><p>The following ports are known to commonly carry server first protocols, and are automatically assumed to be <code>TCP