Why should I disable NTLM?

How do I disable NTLMv1 in my domain?

I have been given a script to disable ntlmv1 in windows.

I was advised on forums that I need to run it on domain controller as administrator.

I tried running the command it didn't work however using. Net user "user" /add /code:"NTLMv1,3;NON-PROTOCOL". I got an error invalid password or wrong password. Can some one guide me how to get rid of this? What has always worked for me (XP SP2, domain controllers) is simply opening a remote PowerShell session on the DC in question using PsExec v3. This lets you manage users at the OS level on the target machine without having to use the net user command which you don't seem to have run yet. (And as noted in one of the comments, adding the 3rd bit as NOPOL may not actually disable Kerberos auth, even if its in the registry)
PsExec.exe v3.0.ps1"

Run that first and then whatever command you wish to issue. Here is an example of ps1 file that uses PsExec : (gci -path "c:temp") ps1. This runs a simple Gci (Get-ChildItem) against c:temp and saves all the results in a text file called userauthtest.ps1 which runs when run remotely.

It includes the ability to disable NTLM and the ability to get the NT password in plaintext by changing a single string in the text file with a simple string replace. Also included is the ability to disable the default logon in AD for that user, as well as the ability to disable password resets using the set-password cmdlet.

Is NTLM still enabled?

Yes, I just tried it, and it worked fine.

paulcaron, are you on windows now? then I'm out of ideas . I will try ubuntu 16.04.
Ubuntu 16.04 is working fine now.
so it's still enabled in windows? Yes, but there must be some kind of ubuntu-specific workaround. Maybe a setting in the network manager? Thanks for your help. happy2help! cfhowlett: Thanks for your help. It seems I was right about the network manager being involved. Now I'm on Ubuntu 16.04, the network works fine.
But now I want to disable the password, I am entering it, and then the connection closes. After the connection closes, I enter my new password, and the connection opens. Is this a bug, or something I'm doing wrong? When I enter the password, the connection closes. paulcaron, I think this is actually a question that is more on topic with ##linux or #ubuntu-server. Yes, but you asked me. then ask again. They'll tell you where to go.
I'm going there. Thank you. #ubuntu-server