Merge pull request dat#8 from chyikwei/fix_socket_error

handle socket error (for issue dat#7)

Author: dat

ner/utils.py

@@ -20,6 +20,8 @@ def tcpip4_socket(host, port):
     finally:
         try:
             s.shutdown(socket.SHUT_RDWR)
+        except socket.error:
+            pass
         except OSError:
             pass
         finally: