Microsoft KB Archive/296859

= Error Message: The UPS Service Could Not Access the Specified Comm Port =

Article ID: 296859

Article Last Modified on 1/31/2007

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APPLIES TO


 * Microsoft Windows 2000 Service Pack 1
 * Microsoft Windows 2000 Service Pack 2
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Service Pack 1
 * Microsoft Windows 2000 Service Pack 2

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This article was previously published under Q296859



SYMPTOMS
When you try to choose a manufacturer for an Uninterruptible Power Supply (UPS) on the UPS tab in the Power Options tool in Control Panel, you may receive the following error message:

The UPS service could not access the specified Comm Port.



CAUSE
This problem can occur if your computer only has one COM port that is not configured as COM1.



RESOLUTION
To work around this problem, manually select the COM port:
 * 1) Click Start, point to Settings, click Control Panel, and then double-click Power Options.
 * 2) Click the UPS tab, and then click Select.
 * 3) In the On Port box, click your COM port. Note that you may only have one choice.
 * 4) Click Finish, and then click OK.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Windows 2000 Service Pack 3.



MORE INFORMATION
The default value for the COM port when installing a UPS is COM1. Because of this, this setting is automatically written to the registry when you click the UPS tab. Until the actual COM port is selected, the registry setting remains at COM1. This information is stored under the following registry key:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\UPS

Value: Port: REG_SZ: COMx, where x=COM port number

Additional query words: kbShell american power conversion aps

Keywords: kberrmsg kbbug kbfix kbshell kbhardware kbwin2000sp3fix KB296859

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