Revise action steps and add cipher suite update guidance

Updated action items and added guidance for updating cipher suites for various Azure services.

Author: Harikrishnan-M-B

articles/frontdoor/diffie-hellman-ciphers.md

@@ -25,14 +25,15 @@ You're affected if any of the following are true:
 
 ## How will I know if I'm impacted?
 * Impacted subscriptions and resources will receive Azure service health notification and email notifications.
+* The impacted connection leg ('client to service' or 'service to origin' or both) will be mentioned in the notification.
 
 ## What is the impact if I don't act?
 * Connections that can only use the retired DHE ciphers will fail the TLS handshake (for clients) or fail on service to origin negotiation (for origins). 
 * Typical symptoms include handshake failure / no shared cipher errors / invalid cipher error in clients or origin server logs.
 
 ## Action required
-1.	Ensure your origin servers disable DHE ciphers and enable the recommended cipher suites. 
-2.	Inform your clients to disable DHE ciphers and enable the recommended cipher suites.
+1.	Ensure your origin servers disable DHE ciphers and enable the recommended cipher suites.
+3.	Inform your clients to disable DHE ciphers and enable the recommended cipher suites.
 
 ## Recommended cipher suites
 For best compatibility and security on Azure Front Door / Azure CDN endpoints and origins, we recommend using the following cipher suites:
@@ -43,14 +44,23 @@ For best compatibility and security on Azure Front Door / Azure CDN endpoints an
 * TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384
 * TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256
 
+## Updating cipher suites for common origin types
+
+| Service |	Configuration Method |
+| -- | -- |
+| Azure App Service | 	[Use TLS/SSL settings to set a "Minimum TLS Version" or use ARM templates for fine-grained cipher control.](../app-service/configure-ssl-bindings.md) |
+| Azure Application Gateway | 	[Create a SSL Policy (Predefined or Custom) to select specific cipher suites.](../application-gateway/application-gateway-ssl-policy-overview.md) |
+| Azure API Management | 	[Modify the Service Instance Settings to disable specific ciphers via the "Protocols and Ciphers" blade.](../api-management/api-management-howto-manage-protocols-ciphers.md)	|
+
+
 ## Frequently asked questions
 - Does this affect both client and origin connections?
 
     Yes. The retirement applies to both the client to service and service to origin legs. Update both sides to avoid issues.
 
 - What if I still need legacy client compatibility?
 
-    Migrate clients to support TLS 1.2/1.3 with ECDHE. If you operate controlled clients, update their TLS policy. 
+    The chances of a modern client or server requiring TLS_DHE ciphers as a "must-have" are extremely low as in most places these ciphers have been replaced with the more secure TLS_ECDHE ciphers. Inform your legacy clients to support TLS 1.2/1.3 with ECDHE. If you operate controlled clients, update their TLS policy. 
 
 - Should I make any changes to my Front Door or CDN profiles?