diff --git a/articles/machine-learning/how-to-access-azureml-behind-firewall.md b/articles/machine-learning/how-to-access-azureml-behind-firewall.md
index 86e709cbe7..cdf60b03ca 100644
--- a/articles/machine-learning/how-to-access-azureml-behind-firewall.md
+++ b/articles/machine-learning/how-to-access-azureml-behind-firewall.md
@@ -46,6 +46,7 @@ The following terms and information are used throughout this article:
     | 80 | Unsecured web traffic (HTTP) |
     | 443 | Secured web traffic (HTTPS) |
     | 445 | SMB traffic used to access file shares in Azure File storage |
+    | 5831 | It is a VPN tunnel over UDP, encrypted with TLS | 
     | 8787 | Used when connecting to RStudio on a compute instance |
     | 18881 | Used to connect to the language server to enable IntelliSense for notebooks on a compute instance. |