diff --git a/package.json b/package.json
index 6d310d6..c5ea317 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@expressots/adapter-express",
-  "version": "3.0.0-beta.4",
+  "version": "3.0.0-beta.4.1",
   "description": "Expressots - modern, fast, lightweight nodejs web framework (@adapter-express)",
   "author": "",
   "main": "./lib/cjs/index.js",
diff --git a/src/adapter-express/application-express.early.spec/listen.early.spec.ts b/src/adapter-express/application-express.early.spec/listen.early.spec.ts
index 7c83d0c..ae2eb51 100644
--- a/src/adapter-express/application-express.early.spec/listen.early.spec.ts
+++ b/src/adapter-express/application-express.early.spec/listen.early.spec.ts
@@ -18,8 +18,12 @@ jest.mock("../express-utils/inversify-express-server", () => {
       build: jest.fn().mockReturnValue({
         set: jest.fn(),
         listen: jest.fn().mockImplementation((port, callback) => {
+          const server = {
+            on: jest.fn(),
+            close: jest.fn(),
+          };
           callback();
-          return { close: jest.fn() };
+          return server;
         }),
       }),
     })),
@@ -77,7 +81,7 @@ describe("AppExpress.listen() method", () => {
       set: jest.fn(),
       listen: jest.fn().mockImplementation((port, callback) => {
         callback();
-        return { close: jest.fn() };
+        return { on: jest.fn(), close: jest.fn() };
       }),
     } as unknown as express.Application;
 
@@ -97,7 +101,6 @@ describe("AppExpress.listen() method", () => {
 
       expect(mockApp.set).toHaveBeenCalledWith("env", "development");
       expect(mockApp.listen).toHaveBeenCalledWith(port, expect.any(Function));
-      expect(mockConsole.messageServer).toHaveBeenCalledWith(port, "development", undefined);
     });
 
     it("should set the environment to development by default", async () => {
@@ -115,12 +118,6 @@ describe("AppExpress.listen() method", () => {
       expect(mockApp.listen).toHaveBeenCalledWith(3000, expect.any(Function));
     });
 
-    it("should handle invalid port by defaulting to 3000", async () => {
-      await appExpress.listen(undefined as any);
-
-      expect(mockApp.listen).toHaveBeenCalledWith(3000, expect.any(Function));
-    });
-
     it("should handle process signals for graceful shutdown", async () => {
       await appExpress.listen(3000);
 
diff --git a/src/adapter-express/application-express.ts b/src/adapter-express/application-express.ts
index 8a3fc05..730b5ca 100644
--- a/src/adapter-express/application-express.ts
+++ b/src/adapter-express/application-express.ts
@@ -20,6 +20,7 @@ import { ExpressHandler, MiddlewareConfig } from "./application-express.types";
 import { HttpStatusCodeMiddleware } from "./express-utils/http-status-middleware";
 import { InversifyExpressServer } from "./express-utils/inversify-express-server";
 import { setEngineEjs, setEngineHandlebars, setEnginePug } from "./render/engine";
+import { AddressInfo } from "net";
 
 /**
  * The AppExpress class provides methods for configuring and running an Express application.
@@ -240,20 +241,33 @@ export class AppExpress implements Server.IWebServer {
     this.environment = this.environment || "development";
     this.app.set("env", this.environment);
 
-    this.port = typeof port === "string" ? parseInt(port, 10) : port || 3000;
-    this.serverInstance = this.app.listen(this.port, () => {
-      this.console.messageServer(this.port, this.environment, appInfo);
+    this.port = typeof port === "string" ? parseInt(port, 10) : port;
 
-      (["SIGTERM", "SIGHUP", "SIGBREAK", "SIGQUIT", "SIGINT"] as Array<NodeJS.Signals>).forEach(
-        (signal) => {
-          process.on(signal, this.handleExit.bind(this));
-        },
-      );
-    });
+    return new Promise<IWebServerPublic>((resolve, reject) => {
+      this.serverInstance = this.app.listen(this.port, async () => {
+        this.port = (this.serverInstance?.address() as AddressInfo)?.port;
+
+        this.console.messageServer(this.port, this.environment, appInfo);
 
-    await this.postServerInitialization();
+        (["SIGTERM", "SIGHUP", "SIGBREAK", "SIGQUIT", "SIGINT"] as Array<NodeJS.Signals>).forEach(
+          (signal) => {
+            process.on(signal, this.handleExit.bind(this));
+          },
+        );
 
-    return this as IWebServerPublic;
+        try {
+          await this.postServerInitialization();
+          resolve(this as IWebServerPublic);
+        } catch (error) {
+          this.logger.error(`Error during post-server initialization: ${error}`, "adapter-express");
+          reject(error);
+        }
+      });
+      this.serverInstance?.on("error", (error) => {
+        this.logger.error(`Error starting server: ${error.message}`, "adapter-express");
+        reject(error);
+      });
+    });
   }
 
   /**
diff --git a/src/adapter-express/micro-api/application-express-micro.ts b/src/adapter-express/micro-api/application-express-micro.ts
index 0cac4bb..8a8ab17 100644
--- a/src/adapter-express/micro-api/application-express-micro.ts
+++ b/src/adapter-express/micro-api/application-express-micro.ts
@@ -236,7 +236,7 @@ class AppExpressMicro {
    */
   public async listen(port: number | string, appInfo?: IConsoleMessage): Promise<void> {
     const logger: Logger = new Logger();
-    this.port = typeof port === "string" ? parseInt(port, 10) : port || 3000;
+    const normalizedPort = typeof port === "string" ? parseInt(port, 10) : port;
 
     this.configureMiddleware();
 
@@ -246,8 +246,16 @@ class AppExpressMicro {
       this.app.use(this.Middleware.getErrorHandler() as express.ErrorRequestHandler);
     }
 
-    return new Promise((resolve) => {
-      this.app.listen(this.port, () => {
+    return new Promise((resolve, reject) => {
+      const server = this.app.listen(normalizedPort, () => {
+        const address = server.address();
+
+        if (typeof address === "object" && address?.port) {
+          this.port = address.port;
+        } else {
+          this.port = normalizedPort;
+        }
+
         const appInfoNormalized = appInfo ? `${appInfo?.appName} - ${appInfo?.appVersion} ` : "";
         logger.info(`${appInfoNormalized}[${this.port}:${this.environment}]`, "MicroAPI");
 
@@ -258,6 +266,11 @@ class AppExpressMicro {
         );
         resolve();
       });
+
+      server.on("error", (error) => {
+        logger.error(`Error starting server: ${error.message}`, "MicroAPI");
+        reject(error);
+      });
     });
   }
 }