[jcifs] Access denied when listing shares on a server with Guest account disabled

[Matt Todd]

Even though I am constructing a NtlmPasswordAuthentication object with a
domain (null), username and password it appears to be logging in as
guest when I call SmbFile.listFiles. It works if the server i'm browsing
has a guest account, but if i disable the guest account I get an access
denied message. Why does jcifs not use the login details provided?