diff --git a/packages/platform-express/adapters/express-adapter.ts b/packages/platform-express/adapters/express-adapter.ts
index 20726abd0ed..5fd1fc0c590 100644
--- a/packages/platform-express/adapters/express-adapter.ts
+++ b/packages/platform-express/adapters/express-adapter.ts
@@ -48,6 +48,7 @@ type VersionedRoute = <
 export class ExpressAdapter extends AbstractHttpAdapter {
   private readonly routerMethodFactory = new RouterMethodFactory();
   private readonly logger = new Logger(ExpressAdapter.name);
+  private readonly openConnections = new Set<any>();
 
   constructor(instance?: any) {
     super(instance || express());
@@ -134,6 +135,9 @@ export class ExpressAdapter extends AbstractHttpAdapter {
   }
 
   public close() {
+    this.openConnections.forEach(socket => {
+      socket.destroy();
+    });
     if (!this.httpServer) {
       return undefined;
     }
@@ -202,9 +206,11 @@ export class ExpressAdapter extends AbstractHttpAdapter {
         options.httpsOptions,
         this.getInstance(),
       );
+      this.trackOpenConnections();
       return;
     }
     this.httpServer = http.createServer(this.getInstance());
+    this.trackOpenConnections();
   }
 
   public registerParserMiddleware(prefix?: string, rawBody?: boolean) {
@@ -377,6 +383,13 @@ export class ExpressAdapter extends AbstractHttpAdapter {
     }
   }
 
+  private trackOpenConnections() {
+    this.httpServer.on('connection', socket => {
+      this.openConnections.add(socket);
+      socket.on('close', () => this.openConnections.delete(socket));
+    });
+  }
+
   private isMiddlewareApplied(name: string): boolean {
     const app = this.getInstance();
     return (