diff --git a/pyghmi/ipmi/oem/lenovo/imm.py b/pyghmi/ipmi/oem/lenovo/imm.py
index 90d1b16f..bb0d6b14 100644
--- a/pyghmi/ipmi/oem/lenovo/imm.py
+++ b/pyghmi/ipmi/oem/lenovo/imm.py
@@ -687,12 +687,16 @@ class XCCClient(IMMClient):
         return {'height': int(dsc['u-height']), 'slot': int(dsc['slot'])}
 
     def clear_system_configuration(self):
-        self.wc.grab_json_response(
-            '/redfish/v1/Systems/1/Bios/Actions/Bios.ResetBios',
-            {'Action': 'Bios.ResetBios'},
-            headers={'Authorization': 'Basic ' + base64.b64encode(
-                self.username + ':' + self.password),
-                     'Content-Type': 'application/json'})
+        res = self.wc.grab_json_response(
+                '/redfish/v1/Systems/1/Bios/Actions/Bios.ResetBios',
+                {'Action': 'Bios.ResetBios'},
+                headers={'Authorization': 'Basic ' + base64.b64encode(
+                    self.username + ':' + self.password),
+                         'Content-Type': 'application/json'})
+        if not res:
+            raise Exception(
+                'Unexpected response to clear configuration: {0}'.format(
+                    self.wc.lastjsonerror))
 
     def get_webclient(self, login=True):
         cv = self.ipmicmd.certverify
diff --git a/pyghmi/util/webclient.py b/pyghmi/util/webclient.py
index 18ddb83b..d833fca7 100644
--- a/pyghmi/util/webclient.py
+++ b/pyghmi/util/webclient.py
@@ -100,6 +100,7 @@ class SecureHTTPConnection(httplib.HTTPConnection, object):
                  **kwargs):
         if 'timeout' not in kwargs:
             kwargs['timeout'] = 60
+        self.lastjsonerror = None
         self.broken = False
         self.thehost = host
         self.theport = port
@@ -152,6 +153,7 @@ class SecureHTTPConnection(httplib.HTTPConnection, object):
         return rsp
 
     def grab_json_response(self, url, data=None, referer=None, headers=None):
+        self.lastjsonerror = None
         webclient = self.dupe()
         if isinstance(data, dict):
             data = json.dumps(data)
@@ -163,7 +165,7 @@ class SecureHTTPConnection(httplib.HTTPConnection, object):
         rsp = webclient.getresponse()
         if rsp.status == 200:
             return json.loads(rsp.read())
-        rsp.read()
+        self.lastjsonerror = rsp.read()
         return {}
 
     def download(self, url, file):