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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 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.
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 the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/152734/EN-US/ )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.