Logon Failure: The target account name is incorrect.

In an SBS 2008 environment, when any workstation (including the server) tries to access a shared folder on a specific Windows 7 box:
- using UNC path (eg. \\JACK-WIN7), the error "Logon Failure: The target account name is incorrect" occurs.
- using FQDN (eg. \\JACK-WIN7.mydomain.local), I can successfully access the shares.

I've read numerous articles and most lead to DNS issues. I tried removing the DNS A record related to JACK-WIN7 using the DNS Manager on the server and then ipconfig /flushdns and ipconfig /registerdns on the offending Win7 box.

One clue is, when I:
- ping -a JACK-WIN7 it pings the ip address of a different computer (which has a different computer name)
- ping -a JACK-WIN7.mydomain.local it pings the correct ip address.
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JohnBusiness Consultant (Owner)Commented:
Why would pinging one name come up with the wrong computer? There does not seem to be enough here to say why. Is there another computer named JACK-WIN7? or was there one?

You are trying to connect to a Windows 7 machine.  I use the form:

NET USE Z: \\xxx-WIN7PRO\DriveC where DriveC has been permitted to the list of users allowed to use it.

In your example, you are not using a folder name and that may be part of the issue.

.... Thinkpads_User
Chris HInfrastructure ManagerCommented:
Make sure on both the host and server that netbios is enabled and that both are receiving the correct DNS suffix.
silentreproachAuthor Commented:
Same result occurs if I use a folder name. If I try to access \\JACK-WIN7\Foldername I get the error. If I try to access \\JACK-WIN7.mydomain.local\Foldername then I can access the data okay.

I believe ping resolves to the wrong ip address (and tracert for that matter) due to a DNS record somewhere on the server, but I can't find it yet. This user previously had an XP computer, but I believe it was named JACK-XP.
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JohnBusiness Consultant (Owner)Commented:
There is an article with some information about prior computers. Look through this article below as it may point you to how remove DNS records, or put the old computer in a different OU for a period of time and then delete.


... Thinkpads_User
silentreproachAuthor Commented:
I used this free Active Directory Cleanup tool: http://www.cjwdev.co.uk/Software/ADTidy/Info.html but did not see any duplicate computers. I did disable a couple of old, unrelated computer names.

Still feel like it's a DNS issue but I'm not sure, working on it.
Chris HInfrastructure ManagerCommented:
Go into your reverse lookup zones in the DNS management console on your SBS 2008 server and delete the corresponding records for the incorrect netbios addresses.
Chris HInfrastructure ManagerCommented:
Aslo, just for kicks, make sure there is no entry in the workstation's host file.

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silentreproachAuthor Commented:
CHoward, thanks for the DNS tip. I looked and did not see any records in the reverse lookup zones corresponding to the computer in question Anything else to look for?
silentreproachAuthor Commented:
There were entries in c:\windows\system32\drivers\etc\hosts that must have been put there by a prior administrator. These were outdated compared to DNS and I also cleaned up invalid entries in DNS. Thanks!
JohnBusiness Consultant (Owner)Commented:
@silentreproach - Thank you and thanks for the update.
.... Thinkpads_User
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