Suppress accept_connection2 messages

electrumx_server.py

@@ -38,9 +38,12 @@ def main_loop():
         future.cancel()
 
     def on_exception(loop, context):
+        '''Suppress spurious messages it appears we cannot control.'''
         message = context.get('message')
         if not message in SUPPRESS_MESSAGES:
-            loop.default_exception_handler(context)
+            if not ('task' in context and
+                    'accept_connection2()' in repr(context.get('task'))):
+                loop.default_exception_handler(context)
 
     server = BlockServer(Env())
     future = asyncio.ensure_future(server.main_loop())