Documents are faxed to the wrong destination if several fax clients call the

If several fax clients call the FaxSendDocument API at the same time in Microsoft Windows Server 2003, some documents are faxed to the wrong destination.

This problem occurs if several clients make requests to send a fax at the same time. When this problem occurs, the fax server that is running the Fxssvc.exe instance creates intermediate files to store fax images and queues the files for additional processing. However, these intermediate files have same file name because several clients make requests to send a fax at the same time. Therefore, some documents are faxed to the wrong destination.

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, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site: 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. To create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" section and the online request forms display 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.

Prerequisites

To apply this hotfix, you must have Microsoft Windows Server 2003 Service Pack 1 (SP1) or Windows Server 2003 Service Pack 2 (SP2) installed on the computer. For more information about how to obtain the latest service for Windows Server 2003, click the following article number to view the article in the Microsoft Knowledge Base:

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The English version of this hotfix has the file attributes (or later file attributes) 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 item in Control Panel.

Windows Server 2003 with Service Pack 1, x86-based versions

File name	File version	File size	Date	Time	Platform
Fxssvc.exe	5.2.3790.2925	270,336	26-Apr-2007	11:16	x86

Windows Server 2003 with Service Pack 2, x86-based versions

File name	File version	File size	Date	Time	Platform
Fxssvc.exe	5.2.3790.4069	270,336	26-Apr-2007	18:30	x86

Windows Server 2003, x64-based versions

File name	File version	File size	Date	Time	Platform
Fxssvc.exe	5.2.3790.2925	469,504	26-Apr-2007	08:10	x64

Windows Server 2003 with Service Pack 2, x64-based versions

File name	File version	File size	Date	Time	Platform
Fxssvc.exe	5.2.3790.4069	469,504	26-Apr-2007	08:24	x64

Windows Server 2003 with Service Pack 1, Itanium-based versions

File name	File version	File size	Date	Time	Platform
Fxssvc.exe	5.2.3790.2925	941,568	26-Apr-2007	08:10	IA-64

Windows Server 2003 with Service Pack 2, Itanium-based versions

File name	File version	File size	Date	Time	Platform
Fxssvc.exe	5.2.3790.4069	941,568	26-Apr-2007	08:26	IA-64

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.