NTLM (NT LAN Manager) authentication is used to make the communication between App Volumes Manager and agent more secure.

When an App Volumes agent make an HTTP request to the App Volumes Manager, NTLM is used to authenticate the user and user account with the entry in the Active Directory.

You can disable NTLM by defining a system environment variable on the machine where App Volumes Manager is installed.

See https://technet.microsoft.com/en-us/library/jj852241(v=ws.11).aspx to understand the implications of disabling NTLM.


  1. Log in as administrator to the machine where App Volumes Manager is installed.
  2. Open Control Panel and click System > Advanced System Settings > Environment Variables > New.

    The New System Variable window appears.

  3. In the Variable name text box, enter AVM_NTLM_DISABLED.
  4. In the Variable value text box, enter 1.
  5. Restart the computer.

    The App Volumes Manager service also restarts.