diff --git a/tidevice/_device.py b/tidevice/_device.py
index 27849a7..39de77d 100644
--- a/tidevice/_device.py
+++ b/tidevice/_device.py
@@ -878,9 +878,7 @@ def _launch_wda_app(self,
         conn = self.connect_instruments()
         channel = conn.make_channel(InstrumentsService.ProcessControl)
 
-        conn.call_message(channel, "processIdentifierForBundleIdentifier:",
-                          [bundle_id])
-
+        conn.call_message(channel, "processIdentifierForBundleIdentifier:", [bundle_id])
         # launch app
         identifier = "launchSuspendedProcessWithDevicePath:bundleIdentifier:environment:arguments:options:"
         app_path = app_info['Path']
@@ -1111,7 +1109,7 @@ def _record_test_result_callback(m: DTXMessage):
 
         def _ready_with_caps_callback(m: DTXMessage):
             x2.send_dtx_message(m.channel_id,
-                              payload=DTXPayload.build_other(0x03, xctest_configuration),
+                              payload=DTXPayload.build_other(0x03),
                               message_id=m.message_id)
             
         x2.register_callback('_XCT_testRunnerReadyWithCapabilities:', _ready_with_caps_callback)
diff --git a/tidevice/_safe_socket.py b/tidevice/_safe_socket.py
index 668df2c..09c3b10 100644
--- a/tidevice/_safe_socket.py
+++ b/tidevice/_safe_socket.py
@@ -53,12 +53,19 @@ def __init__(self, addr: Union[str, typing.Tuple[str, int], socket.socket,
             addr: can be /var/run/usbmuxd or localhost:27015 or (localhost, 27015)
         """
         self._id = acquire_uid()
-        self._sock = None
         self._dup_sock = None # keep original sock when switch_to_ssl
         self._name = None
 
+        try:
+            self._sock = self._connect(addr)
+        except Exception as e:
+            raise SocketError("socket connect error") from e
+
+        self._finalizer = weakref.finalize(self, self._cleanup)
+    
+    def _connect(self, addr: Union[str, typing.Tuple[str, int], socket.socket, Any]):
         if isinstance(addr, socket.socket):
-            self._sock = addr
+            return addr
         else:
             if isinstance(addr, str):
                 if ':' in addr:
@@ -71,10 +78,9 @@ def __init__(self, addr: Union[str, typing.Tuple[str, int], socket.socket,
                     raise SocketError("socket unix:{} unable to connect".format(addr))
             else:
                 family = socket.AF_INET
-            self._sock = socket.socket(family, socket.SOCK_STREAM)
-            self._sock.connect(addr)
-
-        self._finalizer = weakref.finalize(self, self._cleanup)
+            sock = socket.socket(family, socket.SOCK_STREAM)
+            sock.connect(addr)
+            return sock
     
     def _cleanup(self):
         release_uid(self.id)