diff --git a/spring-5-reactive-netty/src/main/java/com/baeldung/serverconfig/server/NettyWebServerFactoryBootstrapCustomizer.java b/spring-5-reactive-netty/src/main/java/com/baeldung/serverconfig/server/NettyWebServerFactoryBootstrapCustomizer.java
new file mode 100644
index 000000000000..05b2fbb7f767
--- /dev/null
+++ b/spring-5-reactive-netty/src/main/java/com/baeldung/serverconfig/server/NettyWebServerFactoryBootstrapCustomizer.java
@@ -0,0 +1,49 @@
+package com.baeldung.serverconfig.server;
+
+import io.netty.channel.EventLoopGroup;
+import io.netty.channel.nio.NioEventLoopGroup;
+import io.netty.channel.socket.nio.NioServerSocketChannel;
+import org.springframework.boot.web.embedded.netty.NettyReactiveWebServerFactory;
+import org.springframework.boot.web.embedded.netty.NettyServerCustomizer;
+import org.springframework.boot.web.server.WebServerFactoryCustomizer;
+import org.springframework.stereotype.Component;
+import reactor.netty.http.server.HttpServer;
+
+@Component
+public class NettyWebServerFactoryBootstrapCustomizer implements WebServerFactoryCustomizer<NettyReactiveWebServerFactory> {
+
+    @Override
+    public void customize(NettyReactiveWebServerFactory serverFactory) {
+        serverFactory.addServerCustomizers(new PortCustomizer(8443));
+        serverFactory.addServerCustomizers(new EventLoopNettyCustomizer());
+    }
+
+    private static class PortCustomizer implements NettyServerCustomizer {
+
+        private final int port;
+
+        private PortCustomizer(int port) {
+            this.port = port;
+        }
+
+        @Override
+        public HttpServer apply(HttpServer httpServer) {
+            return httpServer.port(port);
+        }
+    }
+
+    private static class EventLoopNettyCustomizer implements NettyServerCustomizer {
+
+        @Override
+        public HttpServer apply(HttpServer httpServer) {
+            EventLoopGroup parentGroup = new NioEventLoopGroup();
+            EventLoopGroup childGroup = new NioEventLoopGroup();
+            return httpServer
+                    .tcpConfiguration(tcpServer -> tcpServer.bootstrap(
+                            serverBootstrap -> serverBootstrap.group(parentGroup, childGroup).channel(NioServerSocketChannel.class)
+                    ));
+
+        }
+
+    }
+}
diff --git a/spring-5-reactive-netty/src/main/java/com/baeldung/serverconfig/server/NettyWebServerFactoryPortCustomizer.java b/spring-5-reactive-netty/src/main/java/com/baeldung/serverconfig/server/NettyWebServerFactoryPortCustomizer.java
deleted file mode 100644
index 1dda58baa403..000000000000
--- a/spring-5-reactive-netty/src/main/java/com/baeldung/serverconfig/server/NettyWebServerFactoryPortCustomizer.java
+++ /dev/null
@@ -1,30 +0,0 @@
-package com.baeldung.serverconfig.server;
-
-import org.springframework.boot.web.embedded.netty.NettyReactiveWebServerFactory;
-import org.springframework.boot.web.embedded.netty.NettyServerCustomizer;
-import org.springframework.boot.web.server.WebServerFactoryCustomizer;
-import org.springframework.stereotype.Component;
-import reactor.netty.http.server.HttpServer;
-
-@Component
-public class NettyWebServerFactoryPortCustomizer implements WebServerFactoryCustomizer<NettyReactiveWebServerFactory> {
-
-    @Override
-    public void customize(NettyReactiveWebServerFactory serverFactory) {
-        serverFactory.addServerCustomizers(new PortCustomizer(8443));
-    }
-
-    private static class PortCustomizer implements NettyServerCustomizer {
-
-        private final int port;
-
-        private PortCustomizer(int port) {
-            this.port = port;
-        }
-
-        @Override
-        public HttpServer apply(HttpServer httpServer) {
-            return httpServer.port(port);
-        }
-    }
-}
diff --git a/spring-5-reactive-netty/src/main/java/com/baeldung/serverconfig/server/NettyWebServerFactorySslCustomizer.java b/spring-5-reactive-netty/src/main/java/com/baeldung/serverconfig/server/NettyWebServerFactorySslCustomizer.java
index 0aceae39dc74..d03c3a7f4079 100644
--- a/spring-5-reactive-netty/src/main/java/com/baeldung/serverconfig/server/NettyWebServerFactorySslCustomizer.java
+++ b/spring-5-reactive-netty/src/main/java/com/baeldung/serverconfig/server/NettyWebServerFactorySslCustomizer.java
@@ -1,6 +1,8 @@
 package com.baeldung.serverconfig.server;
 
 import org.springframework.boot.web.embedded.netty.NettyReactiveWebServerFactory;
+import org.springframework.boot.web.embedded.netty.SslServerCustomizer;
+import org.springframework.boot.web.server.Http2;
 import org.springframework.boot.web.server.Ssl;
 import org.springframework.boot.web.server.WebServerFactoryCustomizer;
 import org.springframework.stereotype.Component;
@@ -16,7 +18,9 @@ public void customize(NettyReactiveWebServerFactory serverFactory) {
         ssl.setKeyAlias("alias");
         ssl.setKeyPassword("password");
         ssl.setKeyStorePassword("secret");
-        serverFactory.setSsl(ssl);
+        Http2 http2 = new Http2();
+        http2.setEnabled(false);
+        serverFactory.addServerCustomizers(new SslServerCustomizer(ssl, http2, null));
         serverFactory.setPort(8443);
     }
 }