Why would server suddenly reject SMB requests over NetBT?

Discussion in 'Windows Networking' started by Jim A., Sep 8, 2008.

  1. Jim A.

    Jim A. Guest

    On Friday we replaced all the cables in our server room and we come back
    today and realize that our 'scan to file' function on our Canon copiers is no
    longer working.

    If you are not familiar with 'scan to file', you simply have the copier scan
    a document and then it sends it to a preconfigured shared folder.

    So anyway, after much troubleshooting, we decide to analyze packets and
    realize that our server is declining the session request from the copier.

    So I setup a share on a different server and had the copier send the scanned
    file to that share and it worked fine.

    Any ideas?
     
    Jim A., Sep 8, 2008
    #1
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  2. Jim A.

    Jim A. Guest

    Jim A., Sep 8, 2008
    #2
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  3. Jim A.

    Jim A. Guest

    Jim A., Sep 8, 2008
    #3
  4. Hello Jim

    Good day..

    I have went through the netmon traces and found the following observations

    Observation 1 :
    ============

    In the packet 10 , i see that canon sends a NBT Session Request message ,
    this happens after successful 3 ways TCP handshake and falls to the NBT
    protocol for file transfer using SMB protocol.

    In the packet 11 , i see 2 major observations, TCP is sending AP....F ,
    which means that STORE1 is telling that there are no more data from sender,
    and in the NBT parameters , i see that caller name is not present ( session
    service error ).

    This behavior will occur if client port has stopped responding , and in your
    scenario there is no Reset or retransmission of packets, hence the TCP
    communication was smooth.

    Another problem would be the client side application which opens the port is
    closing without establishing the connection, u might re-install the
    application and test it.



    Questions
    =======
    1) Is there an applicatino on the client side ( STORE1 ) ?
    2) Is there any working client ? so that i can compare the netmon trace of
    failure and success client ?


    Regards,
    sainath , SMB KID


    This behavior occurs
     
    Sainath , SMB KID, Nov 10, 2008
    #4
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