cygwin's expect doesn't work with net use?

Answer 1

Here might be some suggestions:

Can you explore to \prosseek\somewhere? If so I imagine that you may need to escape the backslashes \\proseek\somewhere.

The network name piece might also indicate that it cannot resolve the host name.

Answer 2

You probably can't use Cygwin's expect with non-cygwin programs; Cygwin emulates posix ptys, while the Windows programs use Windows' own terminal handling code, which knows nothing about the pipelines that expect is trying to read from and write to.

You've also failed to escape your backslashes in expect; notice that the error message gives a different string from the one you passed in.