Add to known issues

Author: sethmanheim

azure-stack/operator/azure-stack-integrate-endpoints.md

@@ -62,14 +62,13 @@ With the addition of the [Extension Host](azure-stack-extension-host-prepare.md)
 |  |ftp.appservice.*&lt;region>.&lt;fqdn>*|TCP, UDP|21, 1021, 10001-10100 (FTP)<br>990 (FTPS)|
 |VPN Gateways|     |  IP Protocol 50 & UDP| Encapsulation Security Payload (ESP) IPSec & UDP 500 and 4500
 
-
 ## Ports and URLs (outbound)
 
 Azure Stack Hub supports only transparent proxy servers. In a deployment with a transparent proxy uplink to a traditional proxy server, you must allow the ports and URLs in the following table for outbound communication. For more information on configuring transparent proxy servers, see [Transparent proxy for Azure Stack Hub](azure-stack-transparent-proxy.md).
 
 SSL traffic interception is [not supported](azure-stack-firewall.md#ssl-interception) and can lead to service failures when accessing endpoints. The maximum supported timeout to communicate with endpoints required for identity is 60s.
 
-> [!Note]
+> [!NOTE]
 > Azure Stack Hub doesn't support using ExpressRoute to reach the Azure services listed in the following table because ExpressRoute may not be able to route traffic to all of the endpoints.
 
 |Purpose|Destination URL|Protocol / Ports|Source Network|Requirement|

azure-stack/operator/known-issues.md

@@ -237,6 +237,15 @@ To access known issues for a different version, use the version selector dropdow
 
 ::: moniker-end
 
+## Update
+
+### Update URL is changing
+
+- Applicable: This issue applies to all supported versions of Azure Stack Hub.
+- Cause: The update URL for Azure Stack Hub is changing from `https://azurestackhub.azureedge.net/PR/download` to `https://azurestackhub.download.prss.microsoft.com`.
+- Remediation: To enable the update process, you must update your client firewall rules to allow HTTPS traffic from the Azure Stack Hub base URL `https://azurestackhub.download.prss.microsoft.com`.
+- Occurrence: Common.
+
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