When you connect a serial modem to a hot-plug serial interface controller (RS-232) on a Microsoft Windows 2000-based computer, the enumeration process for serial devices (Serenum.sys) may not recognize the modem.
This problem occurs when the Routing and Remote Access service tries to connect to a discovered modem while the Serenum.sys service is enumerating the COM port that is connected to the hot-plug serial interface controller. In this case, the Serenum.sys service locks the port during the enumeration process. Therefore, Routing and Remote Access cannot connect to the device.Note
Serenum.sys is the Windows 2000 filter driver that enumerates serial devices.
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.
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 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.
Date Time Version Size File name
03-Oct-2002 17:48 5.0.2195.6078 14,160 Serenum.sys
03-Oct-2002 17:49 5.0.2195.6078 60,880 Serial.sys
13-Jun-2001 05:05 5.0.2195.3727 3,856 Svcpack1.dll
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For additional information about how to obtain a hotfix for Windows 2000 Datacenter Server, click the following article number to view the article in the Microsoft Knowledge Base:
The Datacenter program and Windows 2000 Datacenter Server product
For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
Description of the standard terminology that is used to describe Microsoft software updates