ERROR_CONNECTION_UNAVAIL - 1201 (0x4B1)
The device is not currently connected but it is a remembered connection.
Updated: Feb 21, 2026
Technical Meaning
The ERROR_CONNECTION_UNAVAIL error code indicates that a device is not currently connected, but the system has previously recognized and remembered this connection. This error typically arises in scenarios where a device was once connected to the system and its presence was recorded, but it is no longer physically or logically available.
Error Details
The numeric value of the error is 1201 (0x4B1) and it signifies that while the device's connection status has changed, the system retains a record of this previous connection. This can occur in various contexts such as network devices, storage devices, or any other peripheral that was previously connected to the system.
Usage Context
This error code is commonly encountered in situations where a device was once recognized and its presence recorded by the operating system but has since been disconnected. The system retains this information for reference purposes, which can be useful in certain scenarios such as reconnection attempts or historical logging of device usage.
Developer Interpretation
Developers should interpret this error code to indicate that while a device is not currently available, it was previously recognized and its connection status has changed. This implies that the system retains information about the previous state of the device, which can be used for various purposes such as logging or reconnection attempts.
Related Errors
ERROR_DEVICE_NOT_CONNECTED(1932)ERROR_NO_SUCH_DEVICE(1945)
FAQ
Q: What does ERROR_CONNECTION_UNAVAIL mean?
A: It indicates that a device was previously connected and its presence recorded, but it is no longer available.
Q: How can I handle this error in my application?
A: You should check if the device is physically present or if there are any issues with the connection. If the device is not available, you may need to take appropriate action such as retrying the operation or handling the disconnection gracefully.
Summary
The ERROR_CONNECTION_UNAVAIL error code (1201) signifies that a previously recognized device is no longer connected but its presence was recorded by the system. This can be useful for logging and reconnection purposes, and developers should handle it appropriately in their applications to ensure smooth operation.