Microsoft KB Archive/810173

= SPX Connection Between the Client and the Server Drops when You Copy Large Files by Using Windows Explorer =

Article ID: 810173

Article Last Modified on 2/28/2007

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APPLIES TO


 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Professional Edition
 * Microsoft Windows 2000 Server

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SYMPTOMS
If you have an SPX connection between an ICA (Independent Computing Architecture) client and a Citrix MetaFrame Server, and you use Windows Explorer to copy a file from a drive that is located on the ICA client to a drive that is located on the Citrix Metaframe Server, you may lose the SPX connection.



CAUSE
This behavior may occur if the server begins to receive packets that are the incorrect size. For example, during the file copy, the packet sizes may start as 454 bytes. During the file transfer the server receives a packet that should be 454 bytes but instead is 534 bytes. When the server receives the 534-byte packet, later packets inherit that packet's byte count. The packet byte count no longer matches the length of the actual data that the server receives. The server recognizes the error and drops the connection.



STATUS
Microsoft has confirmed that this is a problem in the products listed at the beginning of this artilcle.

Additional query words: TDSPX connection drops

Keywords: kbbug kbnofix KB810173

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