diff --git a/src/netnode.py b/src/netnode.py
--- a/src/netnode.py
+++ b/src/netnode.py
@@ -5,6 +5,9 @@ from networkers import NetworkReader,Net
 from hashtree import HashTree
 
 
+class FailedConnection(Exception): pass
+
+
 class BaseConnection: # abstract
 	def __init__(self):
 		self._socket=None