diff --git a/windows/keep-secure/configure-proxy-internet-windows-defender-advanced-threat-protection.md b/windows/keep-secure/configure-proxy-internet-windows-defender-advanced-threat-protection.md
index cd1c409582..0a90b5332b 100644
--- a/windows/keep-secure/configure-proxy-internet-windows-defender-advanced-threat-protection.md
+++ b/windows/keep-secure/configure-proxy-internet-windows-defender-advanced-threat-protection.md
@@ -56,6 +56,7 @@ Primary Domain Controller | .Microsoft.com DNS record
West Europe | winatp-gw-weu.microsoft.com
eu.vortex-win.data.microsoft.com
crl.microsoft.com
*.blob.core.windows.net
North Europe | winatp-gw-neu.microsoft.com
eu.vortex-win.data.microsoft.com
crl.microsoft.com
*.blob.core.windows.net
+
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 to the above listed URLs.