SSH Server Broker and SSH Server Proxy are 2 new services present on Windows 10 Anniversary (can be found at running services.msc from command prompt or pressing win+r). This service is not running under the (Ubuntu) Linux Subsystem for Windows.
If enabled port 22 is open and you can login with a local user. The user must be in the Ssh Users group. With a Microsoft account the username is the one displayed at lusrmgr.msc
Configuration for this can be found at the registry on:
HKLM/System/CurrentControlSet/Control/Ssh/BrokerHKLM/System/CurrentControlSet/Control/Ssh/Sftp
Both of which are read-only except for TrustedInstaller. The configuration seems to be similar to OpenSSH since Microsoft is building a custom implementation for Windows. I also found this from the Microsoft Powershell Github repository on OpenSSH on installing OpenSSH:
https://github.com/PowerShell/Win32-OpenSSH/wiki/Install-Win32-OpenSSH
Der Entwicklermodus muss unter Einstellungen / Updates / Für Entwickler aktiviert werden.