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Windows 2000 Does Not Support Mapping Virtual COM Ports to Infrared Ports


The information in this article applies to:
  • Microsoft Windows versions 2000, 2000 SP1, 2000 SP2 Professional
  • Microsoft Windows versions 2000, 2000 SP1, 2000 SP2 Server
  • Microsoft Windows versions 2000, 2000 SP1, 2000 SP2 Advanced Server


SYMPTOMS

Infrared ports cannot be mapped to a Virtual COM port in Windows 2000.


CAUSE

Windows 2000 does not support virtual serial ports and does not provide a general implementation of IrCOMM to map the ports.


RESOLUTION

For mobile, Infrared Data Association (IrDA)-enabled phones, obtain the update referenced below which adds IrCOMM modem support to Windows 2000. The IrCOMM modem driver recognizes and installs IrCOMM-enabled cell phones as modems. Furthermore, this implementation only supports computer initiated IrCOMM connections to a phone and not the reverse.

NOTE: This update still does not allow for mapping of infrared ports to a Virtual COM port. The added support is specifically for IrDA-enabled mobile phones. This update makes the IrCOMM support identical to Windows XP. For more information on IrCOMM in Windows XP see the following Microsoft Web site:

http://www.microsoft.com/hwdev/infrared/WinXP-IrDA.htm
A supported fix is now available from Microsoft, but it is only intended to correct the problem described in this article and should be applied only to systems that are determined to be at risk of attack. Please evaluate your computer's physical accessibility, network and Internet connectivity, and other factors to determine the degree of risk to your computer. Please see the associated Microsoft Security Bulletin to help make this determination. This fix may receive additional testing at a later time, to further ensure product quality. If your computer is sufficiently at risk, Microsoft recommends that you apply this fix now. Otherwise, wait for the next Windows 2000 service pack that contains this fix.

To resolve this problem immediately, download the fix as instructed below or contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:

http://support.microsoft.com/directory/overview.asp
NOTE: In special cases, charges that are normally incurred for support calls may be canceled, if a Microsoft Support Professional determines that a specific update will resolve your problem. Normal support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The following file is available for download from the Microsoft Download Center:
[GRAPHIC: Download]Download Q252795_w2k_sp3_x86_en.exe now
Release Date: August 21, 2001

For additional information about how to download Microsoft Support files, click the article number below to view the article in the Microsoft Knowledge Base:
Q119591 How to Obtain Microsoft Support Files from Online Services
Microsoft used the most current virus detection software available on the date of posting to scan this file for viruses. Once posted, the file is housed on secure servers that prevent any unauthorized changes to the file.

The English version of this fix should have the following file attributes or later:
   Date         Time   Version        Size    File name
   -------------------------------------------------------
   30-Jul-2001  19:39  5.0.2195.3985  57,296  irda.sys
   16-Jul-2001  20:05  5.0.2195.3865  10,288  irenum.sys
   30-Jul-2001  19:39                 79,989  mdmirmdm.inf
   16-Jul-2001  20:05  5.0.2195.3865  20,208  msircomm.sys 


STATUS

Microsoft has confirmed that this problem could result in some degree of security vulnerability in Windows 2000.


MORE INFORMATION

For information on a buffer overflow vulnerability associated with IrDA support in Windows 2000, see the following Microsoft web site:

http://www.microsoft.com/technet/security/bulletin/ms01-046.asp
Windows 2000 does not support virtual serial ports and does not provide a general implementation of IrCOMM to map the ports. There are several reasons for this:
  • Multiple applications cannot share a virtual serial port. The problem presented here, is that an IrCOMM-based program, such as the Microsoft H/PC Explorer or an IrTran-P-based file transfer program running as a background service can open the single virtual serial port and hold it open until you shut down the computer. No other IrDA program or driver is able to run on that computer. This is true, even though the underlying IrDA protocols provide support to allow multiple programs to wait for incoming connections.


  • Windows 2000 IrDA connections must be supported by multiple device connections. Windows 2000 supports multiple concurrent adapters and IrDA connections to different devices, and cannot support an API and protocol that uses a single device connection.


Attempting to do IrCOMM would have inherit limitations that would not work through the existing serial API, which would prevent the ability to do full error-correction in the IrDA stack and create unreliable connections.

For more information on IrDa support in Windows 2000 see the following Microsoft Web site:
http://www.microsoft.com/hwdev/infrared/IrCOMM.htm
For additional information about how to obtain a hotfix for Windows 2000 Datacenter Server, click the article number below to view the article in the Microsoft Knowledge Base:
Q265173 The Datacenter Program and Windows 2000 Datacenter Server Product
For additional information about how to install multiple hotfixes with only one reboot, click the article number below to view the article in the Microsoft Knowledge Base:
Q296861 Use QChain.exe to Install Multiple Hotfixes with One Reboot
For additional information about how to install Windows 2000 and Windows 2000 hotfixes at the same time, click the article number below to view the article in the Microsoft Knowledge Base:
Q249149 Installing Microsoft Windows 2000 and Windows 2000 Hotfixes

Additional query words: infrared cell cellular mobile digital use as a modem dos denial of service av access violation

Keywords : kbhw kbHardware kbWin2000PreSP3Fix
Issue type : kbbug
Technology : kbwin2000AdvServ kbwin2000AdvServSearch kbwin2000Serv kbwin2000ServSearch kbwin2000Search kbwin2000ProSearch kbwin2000Pro kbWinAdvServSearch kbWin2000AdvServSP2 kbWin2000AdvServSP1 kbWin2000ProSP2 kbWin2000ProSP1 kbwin2000ServSP1 kbwin2000ServSP2


Last Reviewed: August 22, 2001
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Article ID: Q252795

Last Reviewed:
August 22, 2001

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