diff --git a/apps/canvas/back/package.json b/apps/canvas/back/package.json
index 2c9c432..4b35d41 100644
--- a/apps/canvas/back/package.json
+++ b/apps/canvas/back/package.json
@@ -6,7 +6,7 @@
   "type": "commonjs",
   "scripts": {
     "build": "tsc",
-    "format": "prettier --write src/**/*.{js,ts,jsx,tsx}",
+    "format": "prettier --write src/**/*.{js,ts,jsx,tsx} --list-different",
     "format-check": "prettier --check src/**/*.{js,ts,jsx,tsx}",
     "lint": "eslint .",
     "start": "node dist/index.js"
diff --git a/apps/canvas/front/src/components/node-gateway-tcp.tsx b/apps/canvas/front/src/components/node-gateway-tcp.tsx
index bd1e5b6..c37f31b 100644
--- a/apps/canvas/front/src/components/node-gateway-tcp.tsx
+++ b/apps/canvas/front/src/components/node-gateway-tcp.tsx
@@ -209,15 +209,29 @@
 			});
 			store.setEdges(
 				edges.concat(
-					exp.map(
-						(e): Edge => ({
-							id: uuidv4(),
-							source: e.serviceId,
-							sourceHandle: "ports",
-							target: id,
-							targetHandle: "tcp",
-						}),
-					),
+					exp.map((e): Edge => {
+						const sn = nodes.find((n) => n.id === e.serviceId);
+						if (sn == null) {
+							throw new Error(`Service ${e.serviceId} not found`);
+						}
+						if (sn.type === "app") {
+							return {
+								id: uuidv4(),
+								source: e.serviceId,
+								sourceHandle: "ports",
+								target: id,
+								targetHandle: "tcp",
+							};
+						} else {
+							return {
+								id: uuidv4(),
+								source: e.serviceId,
+								sourceHandle: "env_var",
+								target: id,
+								targetHandle: "tcp",
+							};
+						}
+					}),
 				),
 			);
 		},