DFS network drive mapping hangs file explorer

Discussion in 'File Systems' started by Rob A, Apr 30, 2009.

  1. Rob A

    Rob A Guest

    I have a pair of DFSR servers W2K3 SP2 R2 setup for DFS on the same domain.
    When users from the citrix farm, which has a mapped drive to the DFS share,
    open file explorer it runs OK for about 30 secs then starts to freeze, it
    will release after another minute or so, but then freeze again and is
    unusable in this state.
    The DFS share is on a back end SAN attached storage device, however I can
    browse using the DFS host servers without any problems.

    Have you any suggestions which may point me towards the cause of the problem.
    I have run network tests at the same time as the file explorer hang and they
    show no issues with network connectivity or timing.
    Rob A, Apr 30, 2009
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  2. Hello Rob,

    Two possible causes might be share permissions incompartibility or dns
    related issue.
    Does the users have proper atleast list folder contents on the main share?

    Also, check your anti virus software log etc.
    Isaac Oben [MCITP,MCSE], Apr 30, 2009
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  3. Does it work to connect to the DFS shares from a non-Citrix client (not to
    the shares on the servers themselves, but to the same DFS paths)?
    Anthony [MVP], May 1, 2009
  4. Rob A

    Rob A Guest

    Hi Isaac
    Thank you for the suggestions I am working through them. I have also
    established during the tests that the only file explorers that are suffering
    from this are the ones on the citrix servers, although I have been testing
    with RDP to the desktop which also has the same problem. I do suspect that
    one of the settings I am applying from the GPO is inducing the problem but so
    far I have not been able to find it.


    Rob A, May 1, 2009
  5. Rob A

    Rob A Guest

    HI Antony
    Thank you for your interest in my issue.
    While I have been running tests from Isaac's suggestions I have managed to
    narrow the error down to W2K3 SP2 client servers.
    Client browsers from Servers at w2k3 sp1 all work with no issue. As soon as
    I try a server with w2k3 SP2, which can be citrix or application server or
    indeed one of the host DFS servers then it hangs file explorer. On the DFS
    host I tried the local drive mapping without a problem but as soon as I
    mapped to the DFS share name it hangs. These DFS servers are at SP2.
    So, I have now created a set of DFS servers at SP1, and guess what, they
    work fine from the local host, and any client server at SP1, but as soon as I
    connect from a client server w2k3 at SP2 the file explorer hangs.
    Now my head hurts.
    Rob A, May 2, 2009
  6. Anthony [MVP], May 5, 2009
  7. Rob A

    Rob A Guest

    Hi Anthony
    Yes, I have followed up your links and it appears the SNP is the cause of my
    issue. Final testing is taking place now, to confirm issue resolved.
    Rob A, May 7, 2009
  8. Rob A

    Rob A Guest

    Hi Anthony

    Not fixed yet!!
    I have updated the firmware & drivers on the network cards, and also run the
    MS hotfix to disable SNP, but the problem is still there on my sp2 DFSR
    From the client side it behaves like a buffering issue, once full they stop
    the display until sufficient memory is available to continue.
    I have been unable to reproduce the effect this has on the sp1 dfsr servers
    Rob A, May 7, 2009
  9. Try running wireshark and seeing where the communication is breaking down.
    It won't be a clear cut error, but it may give you a clue,
    Anthony [MVP], May 8, 2009
  10. Rob A

    Rob A Guest

    Rob A, May 13, 2009
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