... by installing Service Pack 4 (though SP4 did provide some important security enhancements to Windows NT) . The null session vulnerability can be prevented by making a change to the Windows NT ... 2000, 2001Core NT File Systems•FAT 16•FAT 32•NTFS4 and NTFS5Any discussion of NT or Windows 2000 should be based on the NTFS file system. The differences between NT 4.0 and NT 5.0 (Win 2K) ... have learned are: HARDWARE, SAM, SECURITY, SOFTWARE, and SYSTEM. LSA (the Local Security Authority), which controls the security mechanisms integrated into NT, is a subkey of the SYSTEM key....