diff --git a/lib/src/main/java/io/ably/lib/realtime/ChannelBase.java b/lib/src/main/java/io/ably/lib/realtime/ChannelBase.java
index cf0345108..6f2a6e468 100644
--- a/lib/src/main/java/io/ably/lib/realtime/ChannelBase.java
+++ b/lib/src/main/java/io/ably/lib/realtime/ChannelBase.java
@@ -90,6 +90,16 @@ public abstract class ChannelBase extends EventEmitter<ChannelEvent, ChannelStat
      */
     private boolean released = false;
 
+    private ErrorInfo msgError;
+
+    private ErrorInfo getMsgError() {
+        ErrorInfo error = this.msgError;
+        if (error != null) {
+            this.msgError = null;
+        }
+        return error;
+    }
+
     /***
      * internal
      *
@@ -218,6 +228,7 @@ synchronized void transferQueuedPresenceMessages(List<QueuedMessage> messagesToT
     private boolean attachResume;
 
     private void attachImpl(final boolean forceReattach, final CompletionListener listener) throws AblyException {
+        ErrorInfo lastProtocolMsgError = this.getMsgError();
         Log.v(TAG, "attach(); channel = " + name);
         if(!forceReattach) {
             /* check preconditions */
@@ -249,7 +260,7 @@ private void attachImpl(final boolean forceReattach, final CompletionListener li
             if (listener != null) {
                 on(new ChannelStateCompletionListener(listener, ChannelState.attached, ChannelState.failed));
             }
-            setState(ChannelState.attaching, null);
+            setState(ChannelState.attaching, lastProtocolMsgError);
             return;
         }
 
@@ -277,7 +288,7 @@ private void attachImpl(final boolean forceReattach, final CompletionListener li
                 attachMessage.setFlag(Flag.attach_resume);
             }
 
-            setState(ChannelState.attaching, null);
+            setState(ChannelState.attaching, lastProtocolMsgError);
             connectionManager.send(attachMessage, true, null);
         } catch(AblyException e) {
             throw e;
@@ -1302,6 +1313,7 @@ void onChannelMessage(ProtocolMessage msg) {
                 case attached:
                 case suspended:
                     /* Unexpected detach, reattach immediately as per RTL13a */
+                    this.msgError = msg.error; // Propagate msg error to ATTACHING stateChange event
                     Log.v(TAG, String.format(Locale.ROOT, "Server initiated detach for channel %s; attempting reattach", name));
                     attachWithTimeout(true, null);
                     break;
diff --git a/lib/src/test/java/io/ably/lib/test/realtime/RealtimeChannelTest.java b/lib/src/test/java/io/ably/lib/test/realtime/RealtimeChannelTest.java
index c5822cb13..e6c8b8a6a 100644
--- a/lib/src/test/java/io/ably/lib/test/realtime/RealtimeChannelTest.java
+++ b/lib/src/test/java/io/ably/lib/test/realtime/RealtimeChannelTest.java
@@ -1813,11 +1813,16 @@ public void server_initiated_detach_for_attached_channel() throws AblyException
             ProtocolMessage detachedMessage = new ProtocolMessage() {{
                 action = Action.detached;
                 channel = channelName;
+                error = new ErrorInfo("Simulated detach", 40000);
             }};
             ably.connection.connectionManager.onMessage(null, detachedMessage);
 
             /* Channel should transition to attaching, then to attached */
-            channelWaiter.waitFor(ChannelState.attaching);
+            ErrorInfo detachErr = channelWaiter.waitFor(ChannelState.attaching);
+            Assert.assertNotNull(detachErr);
+            Assert.assertEquals(40000, detachErr.code);
+            Assert.assertEquals("Simulated detach", detachErr.message);
+
             channelWaiter.waitFor(ChannelState.attached);
 
             List<ChannelState> channelStates = channelWaiter.getRecordedStates();
@@ -1869,11 +1874,16 @@ public void server_initiated_detach_for_suspended_channel() throws AblyException
             ProtocolMessage detachedMessage = new ProtocolMessage() {{
                 action = Action.detached;
                 channel = channelName;
+                error = new ErrorInfo("Simulated detach", 40000);
             }};
             ably.connection.connectionManager.onMessage(null, detachedMessage);
 
             /* Channel should transition to attaching, then to attached */
-            channelWaiter.waitFor(ChannelState.attaching);
+            ErrorInfo detachError = channelWaiter.waitFor(ChannelState.attaching);
+            Assert.assertNotNull(detachError);
+            Assert.assertEquals(40000, detachError.code);
+            Assert.assertEquals("Simulated detach", detachError.message);
+
             channelWaiter.waitFor(ChannelState.attached);
 
             List<ChannelState> channelStates = channelWaiter.getRecordedStates();