This article was previously published under Q192786
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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.
When modems are enumerated by Pnpisa.sys, entries are created in theregistry. When installing a third-party driver that is the equivalent ofSerial.sys, these entries confuse Serial.sys. During startup, Serial.sysattempts to manage this device and claim those resources already used bythe third-party driver. This process fails and reports this as an errorwhen, in fact, it is informational as the device on COM1 is stillfunctioning.
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, click the following article number to view the article in theMicrosoft Knowledge Base:
152734 How to Obtain the Latest Windows NT 4.0 Service Pack
Microsoft has confirmed that this is 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.