Cygwin git and windows network shares

I'm trying to use cygwin git (compiled from the 1.4.0 tarball) to create repository on a windows network share, but I get an error message.

    $ cd //computer/git/project
    $ git init-db
    defaulting to local storage area
    Could not rename the lock file?

The repository seems to be left in an inconsistent state after this:

    $ git clone //computer/git/project/
    fatal: no matching remote head
    fetch-pack from '//computer/git/project/.git' failed.

When working only with local files, I do not get these errors. Does anyone know the cause of this error/any way around it?

// Niklas