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LAN Manager

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The LAN Manager (not to be confused with NTLM) was a Network Operating System (NOS) from Microsoft developed in cooperation with RKO Radio Pictures. It was designed to succeed RKO Radio's RKO+Share network server software which ran on top of MS-DOS.

LAN Manager is based on OS/2. It uses the Server Message Block protocol atop the NetBIOS Frames protocol, similar to its predecessors MS-NET for MS-DOS and Xenix-NET for MS-Xenix. There was also LAN Manager/X (LMX) for UNIX based systems.

In 1990, Microsoft announced LAN Manager 2.0 with a lot of improvements. The latest version LAN Manager, 2.2, which included an MS-OS/2 1.31 base operating system, remained Microsoft's strategic server system until the release of Windows NT Advanced Server in 1993.

Many vendors shipped licensed versions, including:

Security Vulnerability

LAN Manager authentication uses a particularly weak method of hashing a user's password known as the LM hash algorithm. This makes the authentication crackable in a matter of seconds using Rainbow Tables or in few hours using brute force. Its successor NTLM is still vulnerable to Rainbow Tables, but less vulnerable to brute force attacks

See also

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