POSIX was not. It's call SUA and I still enable it, and on w7 run Gentoo bootstrap under it. It works well enough and I even see sshd run as a service process.

Googling turned up only a really thin wikipedia article - got some links on how you're doing that? That's really quite cool.

It was very much an exploration project, so there isn't a single source. I used https://www.gentoo.org/proj/en/gentoo-alt/prefix/techdocs.xm... and SUA Community forum that is down now, on some of the necessary code patching.

Thanks, I didn't know that SUA still uses a subsystem that's different from the Win32 subsystem. However, it's a different one (Interix) from the old POSIX subsystem, as far as I know. Or does anyone know whether it shares or inherits some code from it?

Sadly, SUA is only available in the Ultimate and Enterprise editions of Win7.

Didn't POSIX subsystem have no access to TCP/IP?