Originally posted here by ammo
<quote>Moral of this story: always cover port 139.</quote>

True, but Win2000 and WinXP also listen on port 445 for SMB service directly over TCP. port 139 is like "smb over netbios over tcp" (sortof)...

Moral of this follow up: if you run w2k or wXP, always cover port 139 AND 445

Ammo
yup... no need to search for smtp / pop3 just port 139 / 445
usually 139 is enough