diff --git a/trezorlib/protobuf_json.py b/trezorlib/protobuf_json.py
index 412a885219..908b9065b8 100644
--- a/trezorlib/protobuf_json.py
+++ b/trezorlib/protobuf_json.py
@@ -85,6 +85,8 @@ def pb2json(pb):
     for field,value in fields:
         if field.type == FD.TYPE_MESSAGE:
             ftype = pb2json
+        elif field.type == FD.TYPE_ENUM:
+            ftype = lambda x: field.enum_type.values[x].name
         elif field.type in _ftype2js:
             ftype = _ftype2js[field.type]
         else:
@@ -109,10 +111,10 @@ _ftype2js = {
     FD.TYPE_FIXED32: float,
     FD.TYPE_BOOL: bool,
     FD.TYPE_STRING: unicode,
-    #FD.TYPE_MESSAGE: pb2json,        #handled specially
+    #FD.TYPE_MESSAGE handled specially
     FD.TYPE_BYTES: lambda x: binascii.hexlify(x),
     FD.TYPE_UINT32: int,
-    FD.TYPE_ENUM: str,
+    # FD.TYPE_ENUM: handled specially
     FD.TYPE_SFIXED32: float,
     FD.TYPE_SFIXED64: float,
     FD.TYPE_SINT32: int,
@@ -129,7 +131,7 @@ _js2ftype = {
     FD.TYPE_FIXED32: float,
     FD.TYPE_BOOL: bool,
     FD.TYPE_STRING: unicode,
-    # FD.TYPE_MESSAGE: json2pb,    #handled specially
+    # FD.TYPE_MESSAGE handled specially
     FD.TYPE_BYTES: lambda x: binascii.unhexlify(x),
     FD.TYPE_UINT32: int,
     FD.TYPE_ENUM: lambda x: getattr(types, x),
diff --git a/trezorlib/transport_bridge.py b/trezorlib/transport_bridge.py
index 77e864e473..a0be923cbe 100644
--- a/trezorlib/transport_bridge.py
+++ b/trezorlib/transport_bridge.py
@@ -11,6 +11,9 @@ import messages_pb2 as proto
 TREZORD_HOST = 'http://localhost:21324'
 CONFIG_URL = 'https://mytrezor.com/data/plugin/config_signed.bin'
 
+def get_error(resp):
+    return ' (error=%d str=%s)' % (resp.status_code, resp.json()['error'])
+
 class BridgeTransport(Transport):
     def __init__(self, device, *args, **kwargs):
 
@@ -22,11 +25,11 @@ class BridgeTransport(Transport):
 
         r = requests.post(TREZORD_HOST + '/configure', data=config)
         if r.status_code != 200:
-            raise Exception('trezord: Could not configure')
+            raise Exception('trezord: Could not configure' + get_error(r))
 
         r = requests.get(TREZORD_HOST + '/enumerate')
         if r.status_code != 200:
-            raise Exception('trezord: Could not enumerate devices')
+            raise Exception('trezord: Could not enumerate devices' + get_error(r))
         enum = r.json()
 
         if len(enum) < 1:
@@ -41,14 +44,14 @@ class BridgeTransport(Transport):
     def _open(self):
         r = requests.post(TREZORD_HOST + '/acquire/%s' % self.path)
         if r.status_code != 200:
-            raise Exception('trezord: Could not acquire session')
+            raise Exception('trezord: Could not acquire session' + get_error(r))
         resp = r.json()
         self.session = resp['session']
 
     def _close(self):
         r = requests.post(TREZORD_HOST + '/release/%s' % self.session)
         if r.status_code != 200:
-            raise Exception('trezord: Could not release session')
+            raise Exception('trezord: Could not release session' + get_error(r))
         else:
             self.session = None
 
@@ -61,7 +64,7 @@ class BridgeTransport(Transport):
         payload = '{"type": "%s","message": %s}' % (cls, json.dumps(msg))
         r = requests.post(TREZORD_HOST + '/call/%s' % self.session, data=payload)
         if r.status_code != 200:
-            raise Exception('trezord: Could not write message')
+            raise Exception('trezord: Could not write message' + get_error(r))
         else:
             self.response = r.json()