I discovered a strange behaviour (bug ?) with Samba and Windows explorer.exe. I explain it here in the hope it will be usefull to others. Tested with: Samba 3.2.5 from Debian Lenny Windows XP Pro and Windows 2003 into a workgroup If we disable netbios daemon *and* we set a netbios name (every other parameters left unchanged from orginal file): netbios name = "whatever" disable netbios = yes then we get this: - from smbclient, everything is OK - from the Windows commande line, everything is ok example: net use H: \\mysambaserver\myshare /user:sambauser - from the Windows GUI (explorer.exe) it is impossible to access to Samba shares 1 - logon to your Windows box with user "windowsuser" 2 - open explorer 3 - type \\mysambaserver in the address bar 4 - Windows asks for a username and password 5 - type "sambauser" then the password 6 - an error message states about the fact you taped a wrong password or the ressource is not reachable I digged into the detailled logs and found explorer don't send the correct username "sambauser". It only send "windowsuser". If we have the same username *and* password on your Windows box and on Samba, we don't see the problem. Removing "netbios name" solve the problem.