File server for Windows does not work after security update

I just upgraded the security update that was released last week and all of a sudden the computers windows cannot access the server. I'm under 10.11.6 and everything was great until we started windows computers today. They can ping and access the internet, but they cannot access SMB on the server.

Macs have no connection problems in the SMB and AFP.

Any ideas, what has changed? Users of server are all still there and it seems like it should work. I can access the web page of servers too.

Make sure you are including the domain in the user name when signing in. for example USER: groupe_travail

Also, check that your windows machine has the correct set of LM compatibility level. For El Cap servers must be set to 3.

Follow the instructions below to change the Windows security settings to allow Windows SMB connections.

  1. Click on the Start button and in the bottom search bar, type regedit . Select search results regedit and the registry opens.
  2. Using the folders on the left side of the screen, navigate through the tree to the following location: \HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa
  3. In the right window, find the following DWORD value: LmCompatibilityLevel . If it exists, double-click it and set the value to 3 (in decimal).  If it does not exist, right-click in an empty space in the right part of the window and create a new DWORD value called LmCompatibilityLevel and set its value to 3 (in decimal).
  4. Restart the computer.
  5. Re-try to connect to the server via the workstation.

NOTE: The versions Home of windows may not the ability to set the LM, and unfortunately I have not found a way around that.

Tags: Servers and Enterprise Software

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