Unable to access DFS path

Discussion in 'File Systems' started by Ronald, Mar 15, 2009.

  1. Ronald

    Ronald Guest

    I am getting an unpredictable results when attempting to connect to a DFS
    directory. I also have intermittent issue where DFS root cannot be mapped.
    Help needed

    Problem Description:
    Intermittently unable to access or map to DFS root
    e.g. \\domain\dfs
    Cannot access DFS root from Start > Run >

    Error message:
    You might not have permission to use this network resource. Contact the
    administrator of this server to find out if you have access permissions.
    or
    The file does not have a program associated with its performing action

    When performing a mapping, it keeps prompting for password which is
    definitely valid.


    I need the unc name to work reliably becasue there is going to be an app on
    the W2K3 box that needs to go to this path to grab a file on a time sensitive
    basis. Would be great if someone can share why some clients have this issue
    where some don't.

    Have done extensive research and followin gare some further information

    Following are some action I have taken for your further recommendation.
    1. Compared the IP configuration between 2 machines, (Can access DFS root
    versus cannot access)
    a. DNS settings, suffixes are the same
    b. Change IP address to the same subnet
    c. Repair Network card and disable Windows firewall

    2. Reset AD password and restart machine a few times using both CTRL ALT DEL
    method or from AD tool

    3. Disable any Anti vrius programs

    4. Run Set L command to determine authentication domain controller
    a. Clients are authenticated either Domain01, Domain02 machine
    b. Restart PC and logon again, each time it may be authenticated by
    different Domain controller (01 or 02), but no specific trend was detected
    for PCs without
    None of above works

    Then restarted machine many times and for once , the DFS root is accessible
    with no changes to any settings. The DC authenticating the machine is the
    same as the earlier one which forbidden access to DFS root.

    Continue to restart machine, trying to replicate the error and problem came
    back intermittently without any specific trend.

    Questions:
    1. We had about 7 replica servers with 14 folders with targets, and we have
    setup referral is base on lowest cost, how does a machine knows which DFS
    servers to connect when performing a \\domain\dfs command?

    2. I tried running the DFS tool > Check Status on 1 of the DFS server. Some
    root target are listed as offline. From some desktop client I can still
    access the path by using \\servername\dfs even it is shown as offline but
    from the DFS server, using the open function I am getting failed to launch
    explorer homed at \\servername\dfs
    What does it mean?

    3. Not sure if any settings related to DFS property. Following are the name
    space setup from the DFS management screen > DFS Root Properties >

    General - Nothing paticular
    Referrals -
    - Cache duration = 300
    - Ordering Method = Lowest Cost
    - Client Fail back to preferred targets = CHecked

    Advanced >
    Optimize for consistency is selected.
    What does optimize polling means and shall it be scalability or consistency?

    Appreciate some help from the tech net team
     
    Ronald, Mar 15, 2009
    #1
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  2. Hello Ronald,

    On the server,can you access the dfs GUI from adminitrative menu?
    On commnad prompt, do a net stop dfs & net start dfs and see if this reslove
    the issue

    Isaac
     
    Isaac Oben [MCITP:EA, MCSE], Mar 16, 2009
    #2
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  3. Ronald

    Ronald Guest

    Hi Isaac,
    Thanks for speedy response.

    I am granted access to net stop start the server that I manage which is
    located in AU. Do I need to do that on all reservers or just the AU server?
    Because I may not have the credential to perform that on other machine.

    Rgds
    Ron
     
    Ronald, Mar 16, 2009
    #3
  4. Hello Ron,

    Just on the dc with the dfs root that you are having problem with

    Isaac
     
    Isaac Oben [MCITP:EA, MCSE], Mar 16, 2009
    #4
  5. Ronald

    DaveMills Guest

    Check the NTFS permissions on all the DFS root folders by looking at
    \\DFSServer\C$\DFSRoot (or wherever it is). If you have more than one DFS root
    server it is quite possible that you have different permission on these folders.
    When a client resolves a DFS path is will sometime use DFSServerA and sometimes
    DFSServerB. If the permission are different it could result in access problems
    intermittently.
     
    DaveMills, Mar 17, 2009
    #5
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