Merge pull request #279460 from jaesoni/same-port-l4-ipv6-limitations

Same port - L4 and IPv6 limitations

Author: Jill Grant

articles/application-gateway/application-gateway-faq.yml

@@ -6,7 +6,7 @@ metadata:
   author: greg-lindsay
   ms.service: application-gateway
   ms.topic: faq
-  ms.date: 03/15/2024
+  ms.date: 06/27/2024
   ms.author: greglin
   ms.custom: references_regions, devx-track-azurepowershell
 title: Frequently asked questions about Application Gateway
@@ -557,6 +557,9 @@ sections:
       - question: Which ports are supported for TLS/TCP listeners?
         answer: The same list of [allowed port range and exceptions](application-gateway-components.md#ports) apply for the Layer 4 proxy too.
 
+      - question: How can I use the same port number for Public and Private TLS/TCP proxy listeners?
+        answer: The use of a common port for TLS/TCP listeners is currently not supported.
+
   - name: Configuration - ingress controller for AKS
     questions:
       - question: What is an ingress controller?

articles/application-gateway/configuration-frontend-ip.md

@@ -5,7 +5,7 @@ services: application-gateway
 author: greg-lindsay
 ms.service: application-gateway
 ms.topic: conceptual
-ms.date: 09/14/2023
+ms.date: 06/27/2024
 ms.author: greglin
 ---
 
@@ -38,6 +38,9 @@ A frontend IP address is associated to a *listener*, which checks for incoming r
 
 You can create private and public listeners with the same port number. However, be aware of any network security group (NSG) associated with the Application Gateway subnet. Depending on your NSG's configuration, you might need an allow-inbound rule with **Destination IP addresses** as your application gateway's public and private frontend IPs. When you use the same port, your application gateway changes the **Destination** of the inbound flow to the frontend IPs of your gateway.
 
+> [!NOTE]
+> Currently, the use of the same port number for public and private TCP/TLS protocol or IPv6 listeners is not supported.
+
  **Inbound rule**:
 
 - **Source**: According to your requirement