Ran into the same issue, evenutally traced to a failed PSU on my domain controller. But along the way I discovered that if you are logged in to windows with cached credentials, you can still connect to NASLite by specifying NAS-User as the user name when you connect.
In typical windows design, the username filed is disabled on the login prompt and it only tries to connect as "guest". So you have to use the net command from a command prompt:
Or just put something like this in a batch file:
net use \\MyNasLiteBox /USER:NAS-User
net use \\MyNasLiteBox\Disk-1 /USER:NAS-User
net use \\MyNasLiteBox\Disk-2 /USER:NAS-User
net use \\MyNasLiteBox\Disk-3 /USER:NAS-User
net use \\MyNasLiteBox\Disk-4 /USER:NAS-User
net use \\MyNasLiteBox\Disks /USER:NAS-User
net use \\MyNasLiteBox\info /USER:NAS-User
Once you've attached it should work as long as you stay logged in.