Update tcp-tls-proxy-overview.md

Author: jaesoni

articles/application-gateway/tcp-tls-proxy-overview.md

@@ -5,7 +5,7 @@ services: application-gateway
 author: greg-lindsay
 ms.service: application-gateway
 ms.topic: conceptual
-ms.date: 03/01/2024
+ms.date: 03/12/2024
 ms.author: greglin
 ---
 
@@ -46,6 +46,7 @@ Process flow:
 
 - A WAF v2 SKU gateway allows the creation of TLS or TCP listeners and backends to support HTTP and non-HTTP traffic through the same resource. However, it does not inspect traffic on TLS and TCP listeners for exploits and vulnerabilities. 
 - The default [draining timeout](configuration-http-settings.md#connection-draining) value for backend servers is 30 seconds. At present, a user-defined draining value is not supported.
+- Client IP preservation is currently not supported.
 
 ## Next steps