diff --git a/src/vs/base/node/ports.ts b/src/vs/base/node/ports.ts
index 83501989f27ee7f808a9b5102b009215ec0adc83..8b649885b6758a1060e6b17c48beab5329f2c9da 100644
--- a/src/vs/base/node/ports.ts
+++ b/src/vs/base/node/ports.ts
@@ -58,7 +58,7 @@ function doFindFreePort(startPort: number, giveUpAfter: number, clb: (port: numb
 		return clb(startPort);
 	});
 
-	client.connect(startPort);
+	client.connect(startPort, '127.0.0.1');
 }
 
 function dispose(socket: net.Socket): void {