| Event Id | 4 |
| Source | ACPI. |
| Description | AMLI: ACPI BIOS is attempting to read from an illegal IO port address (0xcfc), which lies in the 0xcf8 - 0xcff protected address range. This could lead to system instability. Please contact your system vendor for technical assistance. |
| Event Information | CAUSE:
This behavior may occur if your computers basic input/output system (BIOS) tries to write to a port in ACPI Machine Language (AML). This attempt causes Windows Server 2003 to prevent all access to that port.
RESOLUTION: To resolve this issue, contact your computer manufacturer or the BIOS vendor for possible updates to your computer BIOS. |
| Reference Links | Error Message: ACPI BIOS Is Attempting to Write to an Illegal IO Port Address (0x80, 0x400, 0xcf8, 0xcfc) ACPI BIOS is attempting to write to an illegal IO port address" error message when you open the event viewer |
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