diff --git a/docs/install/install-and-use-visual-studio-behind-a-firewall-or-proxy-server.md b/docs/install/install-and-use-visual-studio-behind-a-firewall-or-proxy-server.md
index 5cd274bbfd1..398f27c20d2 100644
--- a/docs/install/install-and-use-visual-studio-behind-a-firewall-or-proxy-server.md
+++ b/docs/install/install-and-use-visual-studio-behind-a-firewall-or-proxy-server.md
@@ -90,6 +90,7 @@ To make sure that you have access to everything you want when you use Visual Stu
 | URL<br>resolution  | go.microsoft.com<br><br>aka.ms | <br/>  | Used to shorten URLs, which then resolve into longer URLs  |
 | Start Page         | vsstartpage.blob.core.windows.net | 443  | Used to display Developer News shown on the start page (Visual Studio 2017 only) |
 | Start Page | vsstartpagenewsfeed.azureedge.net | 443  | Used to display Developer News shown on the start page (Visual Studio 2019 onward) |
+| Sign-in |  aadcdn.msftauth.net<br>aadcdn.msauth.net | https/443 | Used to sign-in with Azure Active Directory account |
 | Targeted<br> Notification <br>Service  | targetednotifications-tm.trafficmanager.net <br><br>www.research.net | 443<br><br>443  | Used to filter a global list of notifications to a list that is applicable only to specific types of machines/usage scenarios |
 | Extension <br>update check  | marketplace.visualstudio.com<br><br>&#42;.windows.net <br>&#42;.microsoftonline.com <br>&#42;.live.com  | 443 | Used to provide notifications when an installed extension has an update available <br><br> Used as a sign-in location |
 | AI Project <br>Integration | az861674.vo.msecnd.net  | 443<br>  | Used to configure new projects to send usage data to your registered Application Insights account |