ERROR_INTERRUPT_VECTOR_ALREADY_CONNECTED - 763 (0x2FB)
The specified interrupt vector was already connected.
Updated: Feb 21, 2026
Technical Meaning
The ERROR_INTERRUPT_VECTOR_ALREADY_CONNECTED error code indicates that an attempt was made to connect a device or interrupt handler to an interrupt vector that is already in use. This can occur during the initialization of device drivers or when configuring system interrupts.
Error Details
When a driver attempts to register itself with a specific interrupt vector, it expects the vector to be free and available for its exclusive use. If another driver has already registered with this same vector, the operating system will return this error code to indicate that the operation cannot proceed as intended.
Usage Context
This error typically arises in scenarios where device drivers are loaded or unloaded, or when interrupt configurations are modified during runtime. It is important for developers to ensure that interrupt vectors are managed correctly to avoid conflicts and maintain system stability.
Developer Interpretation
Developers should interpret this error as an indication that the specified interrupt vector has already been claimed by another driver or component of the operating system. This can lead to issues such as device misconfiguration, performance degradation, or even system instability if not addressed properly.
Related Errors
ERROR_INVALID_PARAMETERERROR_DEVICE_NOT_CONNECTEDERROR_NO_SUCH_DEVICE
FAQ
Q: What does the ERROR_INTERRUPT_VECTOR_ALREADY_CONNECTED error mean?
A: It means that an attempt was made to connect a device or interrupt handler to an interrupt vector that is already in use.
Q: How can I resolve this issue?
A: Ensure that all drivers and components are correctly configured and that no conflicting devices or vectors are present. Review the driver initialization code for any potential issues.
Summary
The ERROR_INTERRUPT_VECTOR_ALREADY_CONNECTED error signifies a conflict during interrupt vector registration, which is critical to maintaining system integrity. Developers should carefully manage interrupt configurations to avoid such errors.