diff --git a/bin/fidlgen_dart/backend/templates/interface.tmpl.go b/bin/fidlgen_dart/backend/templates/interface.tmpl.go
index a2b8549..4b10351 100644
--- a/bin/fidlgen_dart/backend/templates/interface.tmpl.go
+++ b/bin/fidlgen_dart/backend/templates/interface.tmpl.go
@@ -585,7 +585,7 @@
     @override
     {{ template "AsyncReturn" . }} {{ .Name }}({{ template "AsyncParams" .Request }}) async {
       if (!ctrl.isBound) {
-        return new Future.error(new $fidl.FidlStateException('The proxy is closed.'), StackTrace.current);
+        return new Future.error(new $fidl.FidlStateException('Proxy<${ctrl.$interfaceName}> is closed.'), StackTrace.current);
       }
 
       final $fidl.Encoder $encoder = new $fidl.Encoder();
diff --git a/public/dart/fidl/lib/src/interface.dart b/public/dart/fidl/lib/src/interface.dart
index 9e63f4d..60c7e8e 100644
--- a/public/dart/fidl/lib/src/interface.dart
+++ b/public/dart/fidl/lib/src/interface.dart
@@ -293,7 +293,8 @@
   void _handleReadable() {
     final ReadResult result = _reader.channel.queryAndRead();
     if ((result.bytes == null) || (result.bytes.lengthInBytes == 0))
-      throw new FidlError('Unexpected empty message or error: $result');
+      throw new FidlError('Unexpected empty message or error: $result '
+          'from channel ${_reader.channel}');
 
     final Message message = new Message.fromReadResult(result);
     handleMessage(message, sendMessage);
@@ -498,7 +499,7 @@
     _callbackMap.clear();
     _errorCompleter = new Completer<ProxyError>();
     if (!_boundCompleter.isCompleted) {
-      _boundCompleter.completeError('The proxy closed.');
+      _boundCompleter.completeError('Proxy<${$interfaceName}> closed.');
     }
     _boundCompleter = new Completer<Null>();
     _nextTxid = 1;
@@ -508,7 +509,7 @@
   void _handleReadable() {
     final ReadResult result = _reader.channel.queryAndRead();
     if ((result.bytes == null) || (result.bytes.lengthInBytes == 0)) {
-      proxyError('Read from channel failed');
+      proxyError('Read from channel ${_reader.channel} failed');
       return;
     }
     try {
diff --git a/public/dart/fidl/lib/src/interface_async.dart b/public/dart/fidl/lib/src/interface_async.dart
index f9a6229..01900bf 100644
--- a/public/dart/fidl/lib/src/interface_async.dart
+++ b/public/dart/fidl/lib/src/interface_async.dart
@@ -413,7 +413,7 @@
 
   /// Log an [error] message and close the channel.
   void proxyError(FidlError error) {
-    print('Proxy error: ${error.message}');
+    print('AsyncProxyController<${$interfaceName}> error: ${error.message}');
     close();
   }