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Why do network credentials for NAS fail (Error code 0x80070056) even though username and password are correct?

Anonymous
2009-12-10T06:37:00+00:00

When I try to create a system image on a network location Windows asks for Network credentials for the target location. The credentials I enter are correct but I always get an error message that the location can't be used because the password is not correct (Error code 0x80070056).

Screen shot

The target location is a share on a netdrive - D-Link DNS-323. And the share I want access for the backup is already mapped to my computer.

Actually, I got the same error when I mapped the netdrive.

Instead of just using the entered username Windows 7 adds the computer name as domain in front of the user-/login name in this scheme: Computer Name\Login Name

I suppose due to this "domain" addition the authentication fails because the network drive does not recognize the login name with the domain addition. The Windows Network credentials window always said that the (definitely correct) password is incorrect. If you check the box for saving the login information the explorer will allow to open the drive even though the authentication had failed. And by now the mapped drives reconnect automatically and can be accessed out of the explorer without problems.

Is this behavior a bug in Windows 7? Any way to fix or work around this?

Windows for home | Previous Windows versions | Internet and connectivity

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Anonymous
2009-12-11T04:23:19+00:00

Hi Th_Row,

You're on the right track with using the computer name to log in. Have you tried using the Device Name\User Name? The default device name is dlink-[Last 6 Characters of your MAC address].

For example: dlink-ECEA07

So your final user name should look something like this: dlink-ECEA07\UserName

You can also log into your NAS and click Device on the left. On the screen you should see Name; this is your device name.

Try that and let me know if it works!

Cody C

Microsoft Answers Support Engineer

Visit our Microsoft Answers Feedback Forum and let us know what you think.

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  1. Anonymous
    2013-08-08T01:16:37+00:00

    Thanks! I just used the "scheme: Computer Name\Login Name" you said and it worked like a charm for me

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  2. Anonymous
    2010-08-17T23:18:38+00:00

    Thought I'd post the answer that worked for me.  Modifying the Local Policy using the steps below works!

    • Run MMC snap-in secpol.msc
    • Expand Local Policies -> Security Options
    • Find Network security: LAN Manager authentication level
    • Double click and change to “Send LM and NTLM – use NTLMv2 session security if negotiated”

    HTH

    Steve

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  3. Anonymous
    2010-08-17T22:23:18+00:00

    Hello, I've seen the same issue trying to use Windows 7 backup.  I'm backing up to a NAS which uses CISF (WD Netcenter).  I treid the device name\id.  I udpated my Windows 7 Credential Manager to include the device as well. 

    I can create a shortcut/share no problem, but trying to access the device via Windows backup doesn't authenticate.  I get the same error 0x80070056 even though the id/pass is correct.

    Thanks in advance.

    Steve

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