diff --git a/SocketIO.m b/SocketIO.m
index b4d8164..e48cfb8 100755
--- a/SocketIO.m
+++ b/SocketIO.m
@@ -163,6 +163,8 @@ - (void) disconnect
     else if (_isConnecting) {
         [_handshake cancel];
     }
+
+    [self onDisconnect: nil];
 }
 
 - (void) sendMessage:(NSString *)data
@@ -762,10 +764,14 @@ - (void) connection:(NSURLConnection *)connection
 
 - (void) dealloc
 {
+    [_handshake cancel];
+    _handshake = nil;
+
     _host = nil;
     _sid = nil;
     _endpoint = nil;
     
+    _transport.delegate = nil;
     _transport = nil;
     
     [_timeout invalidate];