---
layout: releasenotes
title: Mono 4.0.4 Release Notes
version: 4.0.4
releasedate: '2015-09-10'
---

4.0.4 is the fourth maintenance release of the 4.0 series

Improvements
------------

* Various stability improvements

Bug Fixes
---------

* [31060](https://bugzilla.xamarin.com/show_bug.cgi?id=31060): F# sprintf AOT bug happens still now.
* [30276](https://bugzilla.xamarin.com/show_bug.cgi?id=30276): monotouch-test (classic) assert with Assertion at ../../../../../mono/mono/metadata/class.c:4818, condition `method->klass->generic_class' not met
* [28777](https://bugzilla.xamarin.com/show_bug.cgi?id=28777): GZipStream (DeflateStreamNative) native exception after Flush() with no buffer data: Internal error (no progress possible) Flush
* [30043](https://bugzilla.xamarin.com/show_bug.cgi?id=30043): Disposing a FileSystemWatcher object causes ArgumentOutOfRangeException
* [30869](https://bugzilla.xamarin.com/show_bug.cgi?id=30869): HttpClient authentication not working

Contributors
------------

Alexander Köplinger, Alexis Christoforides, Craig S. Bosma, Gabriel Garcia,
Jo Shields, Marek Safar, Rodrigo Kumpera, Zoltan Varga