When I try to connect to the Linux system from Windows 98, I get that enter password box shown above. I type my User password from Linux, but it fails. I leave it empty, but it fails. I have no other passwords to try. It does the same connecting to any Linux box from the Windows one.
Also, my Linux comps only connect to each other when I type the IP address, selecting the name from the Network place results in a "Cannot get directory list" or something.