diff --git a/windows/security/threat-protection/windows-defender-atp/TOC.md b/windows/security/threat-protection/windows-defender-atp/TOC.md
index 1bda153a18..5e74ba5229 100644
--- a/windows/security/threat-protection/windows-defender-atp/TOC.md
+++ b/windows/security/threat-protection/windows-defender-atp/TOC.md
@@ -119,7 +119,7 @@
 ##### [Network firewall](../windows-firewall/evaluating-windows-firewall-with-advanced-security-design-examples.md)
 #### [Evaluate next generation protection](../windows-defender-antivirus/evaluate-windows-defender-antivirus.md)
 
-### [Access the Windows Security app](community-windows-defender-advanced-threat-protection.md)
+### [Access the Windows Defender Security Center Community Center](community-windows-defender-advanced-threat-protection.md)
 
 ## [Configure and manage capabilities](onboard.md)
 ### [Configure attack surface reduction](configure-attack-surface-reduction.md)
diff --git a/windows/security/threat-protection/windows-defender-atp/configure-proxy-internet-windows-defender-advanced-threat-protection.md b/windows/security/threat-protection/windows-defender-atp/configure-proxy-internet-windows-defender-advanced-threat-protection.md
index c7d9e056c4..2609656756 100644
--- a/windows/security/threat-protection/windows-defender-atp/configure-proxy-internet-windows-defender-advanced-threat-protection.md
+++ b/windows/security/threat-protection/windows-defender-atp/configure-proxy-internet-windows-defender-advanced-threat-protection.md
@@ -11,7 +11,7 @@ ms.pagetype: security
 ms.author: macapara
 author: mjcaparas
 ms.localizationpriority: medium
-ms.date: 09/12/2018
+ms.date: 11/14/2018
 ---
 
 
@@ -98,8 +98,28 @@ United Kingdom | ```uk.vortex-win.data.microsoft.com``` <br>```uk-v20.events.dat
 United States | ```us.vortex-win.data.microsoft.com```<br> ```us-v20.events.data.microsoft.com```<br>```winatp-gw-cus.microsoft.com``` <br>```winatp-gw-eus.microsoft.com```
 
 
+
 If a proxy or firewall is blocking anonymous traffic, as Windows Defender ATP  sensor is connecting from system context, make sure anonymous traffic is permitted in the above listed URLs.
 
+## Windows Defender ATP service backend IP range 
+If you network devices don't support the URLs white-listed in the prior section, you can use the following information.
+
+Windows Defender ATP is built on Azure cloud, deployed in the following regions:
+
+- \+\<Region Name="uswestcentral">
+- \+\<Region Name="useast2">
+- \+\<Region Name="useast">
+- \+\<Region Name="europenorth">
+- \+\<Region Name="europewest">
+- \+\<Region Name="uksouth">
+- \+\<Region Name="ukwest">
+
+
+You can find the Azure IP range on [Microsoft Azure Datacenter IP Ranges](https://www.microsoft.com/en-us/download/details.aspx?id=41653).
+
+>[!NOTE]
+> As a cloud-based solution, the IP range can change. It's recommended you move to DNS resolving setting.
+
 
 ## Verify client connectivity to Windows Defender ATP service URLs