NTSTATUS 0xC0000137 (STATUS_IO_PRIVILEGE

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: Windows could not apply the requested processor I/O-permission state to the process.

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STATUS_OPEN_FAILED	STATUS_ORDINAL_NOT_FOUND

STATUS_IO_PRIVILEGE_FAILED

The process I/O privilege configuration could not be changed

On x86, the processor I/O privilege level controls execution of privileged port-I/O instructions. Windows reserves this mechanism for operating-system and specialized compatibility paths; normal applications should communicate with hardware through a kernel driver and documented device interfaces.

Preserve the architecture, process mode, requested state, and caller privilege. Retrying from an elevated desktop application is not a portable fix and bypassing the driver model can compromise system isolation. On non-x86 architectures the underlying concept or request may not be supported at all.

What to inspect

Confirm the failing path actually requires direct hardware port access.
Use a signed driver and IOCTL interface for legitimate device operations.
Record process architecture and operating-system policy before assuming a privilege problem.

References

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