diff --git a/dragonflow/common/exceptions.py b/dragonflow/common/exceptions.py
index 119f8a28f..49dfc2034 100644
--- a/dragonflow/common/exceptions.py
+++ b/dragonflow/common/exceptions.py
@@ -52,20 +52,6 @@ class DBKeyNotFound(DragonflowException):
     message = _('DB Key not found, key=%(key)s')
 
 
-class SocketReadException(DragonflowException):
-    """
-    An exception for cases when read data from socket.
-    """
-    message = _('Exception happened when read data from socket')
-
-
-class SocketWriteException(DragonflowException):
-    """
-    An exception for cases when send data by socket.
-    """
-    message = _('Exception happened when write data to socket')
-
-
 class UnsupportedTransportException(DragonflowException):
     """
     An exception for cases when the given transport protocol (e.g. UDP, TCP) is
@@ -79,10 +65,6 @@ class DBLockFailed(DragonflowException):
                 "the session=%(sid)s.")
 
 
-class DBClientNotFound(DragonflowException):
-    message = _('DB client not found, ip=%(ip)s')
-
-
 class DBStoreRecordNotFound(DragonflowException):
     message = _('%(record)s not found in db_store!')