Large Files Copy Slowly from a Macintosh Computer to a Windows Server 2003-based Computer That Is Running Services for Macintosh

When you copy a large file from a Macintosh computer to a Microsoft Windows Server 2003-based computer that is running Services for Macintosh, the file copies slowly.

This issue may occur if Windows Server 2003 does not send the final Reply-DSI-Write signal during the transfer of each data block. The Macintosh computer must wait for this signal before it can send more data. When the Macintosh computer does not receive this signal, it waits for about 50 milliseconds, and then it sends an ACK signal to the Window Server 2003-based computer. The ACK signal causes Windows Server 2003 to send the Reply-DSI-Write signal, and the file copy continues. When you copy a large file, these delays add up and increase the time it takes to copy the file.

Hotfix Information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

File Information

The English version of this has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.

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