fix issue #2944: asyncore doesn't handle connection refused correctly (patch by Alexander Shigin). Merged from 2.7 branch.
diff --git a/Lib/asyncore.py b/Lib/asyncore.py
index fba55e0..874f101 100644
--- a/Lib/asyncore.py
+++ b/Lib/asyncore.py
@@ -435,8 +435,11 @@
             self.handle_read()
 
     def handle_connect_event(self):
-        self.connected = True
+        err = self.socket.getsockopt(socket.SOL_SOCKET, socket.SO_ERROR)
+        if err != 0:
+            raise socket.error(err, _strerror(err))
         self.handle_connect()
+        self.connected = True
 
     def handle_write_event(self):
         if self.accepting: