I ran into an issue[1] with the combination of -W and control persist -- using openssh versions < 6.0. netcat worked fine. [1]: https://news.ycombinator.com

I ran into an issue[1] with the combination of -W and control persist -- using openssh versions < 6.0. netcat worked fine. [1]: https://news.ycombinator.com/item?id=4678117