diff --git a/broker/src/main/java/org/eclipse/moquette/spi/impl/BrokerInterceptor.java b/broker/src/main/java/org/eclipse/moquette/spi/impl/BrokerInterceptor.java
index 7786b30f..93007749 100644
--- a/broker/src/main/java/org/eclipse/moquette/spi/impl/BrokerInterceptor.java
+++ b/broker/src/main/java/org/eclipse/moquette/spi/impl/BrokerInterceptor.java
@@ -48,11 +48,12 @@ final class BrokerInterceptor implements Interceptor {
 
     @Override
     public void notifyClientConnected(final ConnectMessage msg) {
+        final ConnectMessage copied = new UnmodifiableConnectMessage(msg);
         for (final InterceptHandler handler : this.handlers) {
             executor.execute(new Runnable() {
                 @Override
                 public void run() {
-                    handler.onConnect(msg.readOnlyClone());
+                    handler.onConnect(copied);
                 }
             });
         }
diff --git a/broker/src/main/java/org/eclipse/moquette/spi/impl/UnmodifiableConnectMessage.java b/broker/src/main/java/org/eclipse/moquette/spi/impl/UnmodifiableConnectMessage.java
new file mode 100644
index 00000000..c438efa7
--- /dev/null
+++ b/broker/src/main/java/org/eclipse/moquette/spi/impl/UnmodifiableConnectMessage.java
@@ -0,0 +1,116 @@
+/*
+ * Copyright (c) 2012-2014 The original author or authors
+ * ------------------------------------------------------
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * and Apache License v2.0 which accompanies this distribution.
+ *
+ * The Eclipse Public License is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * The Apache License v2.0 is available at
+ * http://www.opensource.org/licenses/apache2.0.php
+ *
+ * You may elect to redistribute this code under either of these licenses.
+ */
+package org.eclipse.moquette.spi.impl;
+
+import org.eclipse.moquette.proto.messages.ConnectMessage;
+
+/**
+ * A ConnectMessage that is unmodifiable with copy through copy constructor.
+ *
+ * @author andrea
+ */
+final class UnmodifiableConnectMessage extends ConnectMessage {
+
+    /**
+     * Copy constructor
+     */
+    UnmodifiableConnectMessage(ConnectMessage orig) {
+        this.m_protocolName = orig.getProtocolName();
+        this.m_protocolVersion = orig.getProtocolVersion();
+        this.m_cleanSession = orig.isCleanSession();
+        this.m_willFlag = orig.isWillFlag();
+        this.m_willQos = orig.getWillQos();
+        this.m_willRetain = orig.isWillRetain();
+        this.m_passwordFlag = orig.isPasswordFlag();
+        this.m_userFlag = orig.isUserFlag();
+        this.m_keepAlive = orig.getKeepAlive();
+        this.m_username = orig.getUsername();
+        this.m_password = orig.getPassword();
+        this.m_clientID = orig.getClientID();
+        this.m_willtopic = orig.getWillTopic();
+        this.m_willMessage = orig.getWillMessage();
+    }
+
+    @Override
+    public void setCleanSession(boolean cleanSession) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void setKeepAlive(int keepAlive) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void setPasswordFlag(boolean passwordFlag) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void setProtocolVersion(byte protocolVersion) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void setProtocolName(String protocolName) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void setUserFlag(boolean userFlag) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void setWillFlag(boolean willFlag) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void setWillQos(byte willQos) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void setWillRetain(boolean willRetain) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void setPassword(String password) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void setUsername(String username) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void setClientID(String clientID) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void setWillTopic(String topic) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void setWillMessage(String willMessage) {
+        throw new UnsupportedOperationException();
+    }
+}