OS X XMPP logout Chat Application using xcode 6.4 - macos

I am developing chat application in os x with XMPP framework, where there is main chat viewcontroller with chat view but when user clicks logout button i navigate user to login viewcontroller by calling offline method,xmpp disconnect method and self window close. After this during re-login xmpp connection is not happening.
code used :
-(void)logout
{
[self goOffline];
[self xmppStreamDidDisconnect:xmppStream withError:nil];
ViewController *bcktologin =[self.storyboard instantiateControllerWithIdentifier:#"ViewController"];
[self presentViewControllerAsModalWindow:bcktologin];
[self dismissViewController:self];
[self.view.window close];
}
so after this:
My chat controller keeps running behind, menu created in it is no removed.
No connection to XMPP after re-login
Please guide.

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