diff --git a/packages/independent/custom-elements-redefine/scripts/dev.mjs b/packages/independent/custom-elements-redefine/scripts/dev.mjs
index 1ec59ef249..d982e52599 100644
--- a/packages/independent/custom-elements-redefine/scripts/dev.mjs
+++ b/packages/independent/custom-elements-redefine/scripts/dev.mjs
@@ -2,6 +2,7 @@ import { startDevServer } from "@jsenv/core";
 import { jsenvPluginExplorer } from "@jsenv/plugin-explorer";
 
 export const devServer = await startDevServer({
+  hostname: "127.0.0.1",
   sourceDirectoryUrl: new URL("../src/", import.meta.url),
   port: 3459,
   clientAutoreload: false,
diff --git a/packages/independent/custom-elements-redefine/scripts/test.mjs b/packages/independent/custom-elements-redefine/scripts/test.mjs
index 38e528531e..33c79804b3 100644
--- a/packages/independent/custom-elements-redefine/scripts/test.mjs
+++ b/packages/independent/custom-elements-redefine/scripts/test.mjs
@@ -18,7 +18,7 @@ await executeTestPlan({
     },
   },
   webServer: {
-    origin: "http://localhost:3459",
+    origin: "http://127.0.0.1:3459",
     moduleUrl: new URL("./dev.mjs", import.meta.url),
   },
   githubCheck: false,
diff --git a/packages/related/test/src/execution/web_server/start_using_command.js b/packages/related/test/src/execution/web_server/start_using_command.js
index 05557acf58..71286445f8 100644
--- a/packages/related/test/src/execution/web_server/start_using_command.js
+++ b/packages/related/test/src/execution/web_server/start_using_command.js
@@ -117,7 +117,7 @@ export const startServerUsingCommand = async (
       if (timeoutAbortSource.signal.aborted) {
         // aborted by timeout
         throw new Error(
-          `"${webServer.command}" command did not start a server in less than ${allocatedMs}ms`,
+          `"${webServer.command}" command did not start a server at ${webServer.origin} in less than ${allocatedMs}ms`,
         );
       }
       if (signal.aborted) {
diff --git a/packages/related/test/tests/__internal__/web_server_command/web_server_command.test.mjs b/packages/related/test/tests/__internal__/web_server_command/web_server_command.test.mjs
index 0cb071a6d6..7443854f1b 100644
--- a/packages/related/test/tests/__internal__/web_server_command/web_server_command.test.mjs
+++ b/packages/related/test/tests/__internal__/web_server_command/web_server_command.test.mjs
@@ -20,7 +20,7 @@ import { fileURLToPath } from "node:url";
   } catch (e) {
     const actual = e;
     const expect = new Error(
-      `"${webServer.command}" command did not start a server in less than 500ms`,
+      `"${webServer.command}" command did not start a server at http://localhost:3459 in less than 500ms`,
     );
     assert({ actual, expect });
   }
@@ -43,7 +43,7 @@ import { fileURLToPath } from "node:url";
   } catch (e) {
     const actual = e;
     const expect = new Error(
-      `"${webServer.command}" command did not start a server in less than 500ms`,
+      `"${webServer.command}" command did not start a server at http://localhost:3459 in less than 500ms`,
     );
     assert({ actual, expect });
   }
@@ -68,7 +68,7 @@ import { fileURLToPath } from "node:url";
   } catch (e) {
     const actual = e;
     const expect = new Error(
-      `"${webServer.command}" command did not start a server in less than 500ms`,
+      `"${webServer.command}" command did not start a server at http://localhost:3459 in less than 500ms`,
     );
     assert({ actual, expect });
   }
diff --git a/packages/related/test/tests/__internal__/web_server_module_url/web_server_module_url.test.mjs b/packages/related/test/tests/__internal__/web_server_module_url/web_server_module_url.test.mjs
index 9a41cd4345..30c65df131 100644
--- a/packages/related/test/tests/__internal__/web_server_module_url/web_server_module_url.test.mjs
+++ b/packages/related/test/tests/__internal__/web_server_module_url/web_server_module_url.test.mjs
@@ -45,7 +45,7 @@ import { ensureWebServerIsStarted } from "@jsenv/test/src/execution/web_server_p
     const actual = e.message;
     const expect = `"node ${fileURLToPath(
       webServer.moduleUrl,
-    )}" command did not start a server in less than 500ms`;
+    )}" command did not start a server at http://localhost:9961 in less than 500ms`;
     assert({ actual, expect });
   }
 }
@@ -69,7 +69,7 @@ import { ensureWebServerIsStarted } from "@jsenv/test/src/execution/web_server_p
     const expect = new Error(
       `"node ${fileURLToPath(
         webServer.moduleUrl,
-      )}" command did not start a server in less than 500ms`,
+      )}" command did not start a server at http://localhost:9962 in less than 500ms`,
     );
     assert({ actual, expect });
   }