Windows – System error 86 has occurred

network-drivenetwork-shareswindows 7

I have a windows7 machine where I connect the network drives with the following command:

> net use t: \\pathname\foldername /user:Username password

However, although this was working for years, it stopped working around 2 months ago.
This is the error I am receiving:

System error 86 has occurred
The specified network password is not
correct

The server it is trying to connect to is a windows2008 server. We have a lot of other computers connecting correctly, but they are all in the domain. This one I cannot add to the domain because it is on another network.
However, I tried this with a different computer NOT in the domain (with a local account) and it was working. So I am fairly positive that the problem is with the client machine not with the server.

This is what I tried so far:

  • synchronizing the clock (it was indeed off in the beginning, but
    synchronizing did not solve the error)
  • setting the LAN Manager Authentication to every single option (and restarting every time)
  • the password is definitely correct as it was working with a different machine

Can someone point me in a direction what else I can try? Reinstalling the operating system is unfortunately not an option.

Best Answer

Can someone point me in a direction what else I can try?

If you try to mount a CIFS share on windows 2008 R2 server, the system still prompt for credentials even if you type them correctly.

Furthermore, if you try using shell command net use, you get the following error:

C:\Users\Admini>NET USE R: \\10.0.0.1\share /user:admin password
System error 86 has occurred.
The specified network password is not correct.

To resolve this issue:

  1. go to start > run
  2. type secpol.msc.
  3. Local Policies -> Security Options
  4. Change the value of "Network Security: LAN Manager authentication level" to: LM and NTLM – use NTLMv2 session security if negotiated

enter image description here

Source If you try to mount a share on windows 2008 R2 server the system still prompt for credential even if you type them correctly

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