Promted for username & password when accessing network folder

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G

Guest

We have a set of shared folders on our DC (Server 2003), which all users (XP
SP2) can access. This worked fine for the last 2 years. All of a sudden
users are now prompted for usernames & passwords. Regardless of the login
credentials you supply, it refuses to authenticate the user.

I have read through the other posts I could find for similar scenarios, but
none were very helpful in resolving my issue. I have checked all of the IP
settings, on both clients and the DC. I have checked user accounts and
permissions as well as the actual sharing permissions on the folders, and
everything seems to be in order.

Our folders are set up to allow the DOMAIN Administrator access, but even
this is not working. I have tried accessing the server in the following ways:

1. Start -> Run ->\\servername\sharedfolder
2. Start -> Run ->\\servername
3. Browsing through My Network Places. I can see the server but cannot
access it without being prompted for login info.

I am out of ideas at this stage.

Thanx in advance
L
 
Hi Lucifer,

Are you running any login scripts or client policies on your DC?
How are the groups setup in your AD? Are all your users in one group or
did you split them into various groups with different permitions? Are
your workstations part of the Domain or in a seperate workgroup? Some
guys set it up this way. Don't ask me why. In any way I'm just trying
to get a feel for your setup.

MC.
 
OK, let's see.

Currently we do not run any login scripts, and the only policies we enforce
is for internet config settings, WSUS updates and restrictions to certain
..exe files. We do have some security groups, but nohting which will directly
affect shared files, these are just for internet proxy ACLs. All of the
workstations are joined to the same domain. One thing I did notice just now,
was that some users can connect to the shared folders from certain machines,
but not from other machines.

I also checked the File Sharing sessions on the DC, and it seems that the
user is successfully authenticated, but then loses authentication almost
immediately. Each time I try to open a shared folder a "SUCCESSFUL"
logon/logoff event is entered in the event log.

This is strange, don't you think?
 
Hi Lucifer,

Are you running any login scripts or client policies on your DC?
How are the groups setup in your AD? Are all your users in one group or
did you split them into various groups with different permitions? Are
your workstations part of the Domain or in a seperate workgroup? Some
guys set it up this way. Don't ask me why. In any way I'm just trying
to get a feel for your setup.

MC.
 
I've seen this kind of thing happen when there is a DNS problem on the
server. Sometimes this arises if the network card driver gets auto-updated
and its settings are lost as a result. I've also seen one case where a
second, unused network card activated itself of its own accord, and took over
the default route.

Other thing to check is for time differences. Kerberos auth depends on
clocks being synchronised within about 5min.

While it may see strange that computer-logon still works, It may be that the
users are logging-in with cached credentials and not seeing the
domain-controller at all.
 
OK,

Are there any error messages on the DC or the workstation relating to
logons or security / access permitions?
If there are can you post them here please.
 
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