diff --git a/wlauto/external/daq_server/daqpower-1.0.3.tar.gz b/wlauto/external/daq_server/daqpower-1.0.3.tar.gz
deleted file mode 100644
index 21eaa641..00000000
Binary files a/wlauto/external/daq_server/daqpower-1.0.3.tar.gz and /dev/null differ
diff --git a/wlauto/external/daq_server/daqpower-1.0.4.tar.gz b/wlauto/external/daq_server/daqpower-1.0.4.tar.gz
new file mode 100644
index 00000000..74dc91d4
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diff --git a/wlauto/external/daq_server/src/daqpower/__init__.py b/wlauto/external/daq_server/src/daqpower/__init__.py
index 610d6e92..6019134e 100644
--- a/wlauto/external/daq_server/src/daqpower/__init__.py
+++ b/wlauto/external/daq_server/src/daqpower/__init__.py
@@ -14,4 +14,4 @@
 #
 
 
-__version__ = '1.0.3'
+__version__ = '1.0.4'
diff --git a/wlauto/external/daq_server/src/daqpower/server.py b/wlauto/external/daq_server/src/daqpower/server.py
index 2901f846..e33a5f9c 100644
--- a/wlauto/external/daq_server/src/daqpower/server.py
+++ b/wlauto/external/daq_server/src/daqpower/server.py
@@ -235,7 +235,8 @@ class DaqControlProtocol(LineReceiver):  # pylint: disable=W0223
             else:
                 self.sendError('Received unknown command: {}'.format(request.command))
         except Exception, e:  # pylint: disable=W0703
-            self.sendError('{}: {}'.format(e.__class__.__name__, e.message))
+            message = getattr(e, 'mess', e.message)
+            self.sendError('{}: {}'.format(e.__class__.__name__, message))
 
     def configure(self, request):
         if 'config' in request.params: