diff --git a/apps/harness/server.js b/apps/harness/server.js
index ccf3015..05884ec 100644
--- a/apps/harness/server.js
+++ b/apps/harness/server.js
@@ -3,7 +3,8 @@ const path = require("path");
 const { parse } = require("url");
 
 const dev = process.env.NODE_ENV !== "production";
-const hostname = process.env.HOSTNAME || "0.0.0.0";
+// HOSTNAME in K8s is the pod name — always bind to 0.0.0.0
+const hostname = "0.0.0.0";
 const port = parseInt(process.env.PORT || "3100", 10);
 
 // In production, load the standalone config to avoid webpack dependency