Event ID 11 Changed to an Informational Message

ID: Q192786

The information in this article applies to:

Microsoft Windows NT Server version 4.0
Microsoft Windows NT Server version 4.0, Terminal Server Edition

SYMPTOMS

The following message appears as an warning:


   Event ID   :  11
   Source     :  Serial
   Description:  The hardware resources for COM1 are already in use by
                 another device.

However, the device on COM1 continues to function normally.

CAUSE

When modems are enumerated by Pnpisa.sys, entries are created in the registry. When installing a third-party driver that is the equivalent of Serial.sys, these entries confuse Serial.sys. During startup, Serial.sys attempts to manage this device and claim those resources already used by the third-party driver. This process fails and reports this as an error when, in fact, it is informational as the device on COM1 is still functioning.

RESOLUTION

To resolve this problem, obtain the latest service pack for Windows NT 4.0 or Windows NT Server 4.0, Terminal Server Edition. For additional information, please see the following article in the Microsoft Knowledge Base:

Q152734 How to Obtain the Latest Windows NT 4.0 Service Pack

STATUS

Microsoft has confirmed this to be a problem in Windows NT 4.0 and Windows NT Server 4.0, Terminal Server Edition. This problem was first corrected in Windows NT 4.0 Service Pack 4.0 and Windows NT Server 4.0, Terminal Server Edition Service Pack 4.

Keywords : NT4SP4Fix kbbug4.00 kbfix4.00.sp4
Version : WinNT:4.0
Platform : winnt
Issue type : kbbug