Issues connecting to Windows-based shares

I've got some issues connecting to Windows network shares using jCIFS on
Android. It works great if I use "guest" as the user and leave the password
blank, but if I attempt to log in as an actual user, it'll be extremely
slow or fail.

I've posted a detail explanation of the issue on StackOverflow:
http://stackoverflow.com/questions/14594208/slow-file-listing-with-jcifs-on-windows

Thanks a lot,
Michell