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LAN Manager

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The LAN Manager was an advanced Network Operating System (NOS) from Microsoft developed in cooperation with 3COM. It is based on the Operating System/2 (OS/2) and NetBEUI 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 to be Microsoft's strategic server system until the release of Windows NT Advanced Server in early 1994.

Many vendors shipped licensed versions:

  • 3COM
  • HP LAN Manager/X
  • IBM LAN Server
  • Tapestry Torus

Security Vulnerability

LAN Manager authentication uses a particularly weak method of hashing a user's password known as the LM hash algorithm.

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