Merge pull request #300248 from normesta/normesta-reg-updates-14

Adding some notes to address a CXP bug

Author: prmerger-automator[bot]

articles/storage/blobs/storage-custom-domain-name.md

@@ -6,7 +6,7 @@ author: stevenmatthew
 
 ms.service: azure-blob-storage
 ms.topic: how-to
-ms.date: 02/12/2021
+ms.date: 05/22/2025
 ms.author: shaas
 ms.reviewer: dineshm
 ---
@@ -73,6 +73,9 @@ The host name is the storage endpoint URL without the protocol identifier and th
 
 Create a CNAME record to point to your host name. A CNAME record is a type of Domain Name System (DNS) record that maps a source domain name to a destination domain name.
 
+> [!NOTE]
+> CNAME records must be accessible to public networks. If CNAME records are private, registration with Azure will not succeed. 
+
 1. Sign in to your domain registrar's website, and then go to the page for managing DNS setting.
 
    You might find the page in a section named **Domain Name**, **DNS**, or **Name Server Management**.
@@ -202,6 +205,9 @@ The host name is the storage endpoint URL without the protocol identifier and th
 
 Create a temporary CNAME record to point to your host name. A CNAME record is a type of DNS record that maps a source domain name to a destination domain name.
 
+> [!NOTE]
+> CNAME records must be accessible to public networks. If CNAME records are private, registration with Azure will not succeed.
+
 1. Sign in to your domain registrar's website, and then go to the page for managing DNS setting.
 
    You might find the page in a section named **Domain Name**, **DNS**, or **Name Server Management**.
@@ -385,6 +391,8 @@ This approach involves more steps, but it enables HTTPS access.
 If you don't need users to access your blob or web content by using HTTPS, then see the [Map a custom domain with only HTTP enabled](#enable-http) section of this article.
 The approach involves using [Azure Front Door (preferred)](../../frontdoor/front-door-overview.md) or [Azure CDN](../../cdn/cdn-overview.md) which are Content Delivery Network services offered by Azure.
 
+> [!NOTE]
+> Custom domain mapping requires the use of CNAME records. CNAME records must be accessible to public networks. If CNAME records are private, registration with Azure will not succeed.
 
 ### Using Azure Front Door
 1. Enable [Azure Front Door](../../frontdoor/front-door-overview.md) on your blob or website endpoint.