oak-d-s2 poe

walawala111

Hello all,
I encountered the following issues when using the Oak-D-S2 POE camera:
No matter what script is run, it will always report an error:
with dai. Device (pipeline) as device:
^^^^^^^^^^^^^^^^^^^^
RuntimeError: Failed to connect to device, error message: X_LINK_DEVICE_NOT_FOUND。
Depthai viewer can locate this device, but it cannot connect to it
But I can use the USB version normally. May I ask how to handle this?

I’m on the same LAN and have been able to ping the device successfully. There are no firewalls or VPN active.
It could still be used normally yesterday

jakaskerl

Hi walawala111
Do you perhaps have Wifi active at the same time? This could cause the PC to be confused.

walawala111 Depthai viewer can locate this device, but it cannot connect to it

What do you mean? Any logs you can provide?

Thanks,
Jaka

walawala111

jakaskerl
I still get this error message when I turn off WiFi: X_LINK_VNet NOT-FOUND.
The meaning of 'Depot viewer can locate this device, but it cannot connect to it' is that when I open Depthai viewer, it can recognize the serial number and IP of the POE device I am connecting to, but when I try to connect, it will report an error like in the picture

walawala111

This is the log printed by the depthai viewer：
[2025-06-30T01:53:00Z INFO ewebsock::native_tungstenite] WebSocket handshake has been successfully completed
[2025-06-30T01:53:00Z INFO re_viewer::depthai::ws] Websocket opened
Selecting device: 194430105130781300
Failed to select device: Failed to connect to device, error message: X_LINK_DEVICE_NOT_FOUND
[2025-06-30T01:53:21Z ERROR re_viewer::depthai::depthai] Error: Failed to connect to device, error message: X_LINK_DEVICE_NOT_FOUND, Try to connect the device to
a different port.
Selecting device: 194430105130781300
[2025-06-30 09:53:22.151] [depthai] [warning] [194430105130781300] [169.254.1.222] Flashed bootloader version 0.0.21, less than 0.0.28 is susceptible to bootup/r
estart failure. Upgrading is advised, flashing main/factory (not user) bootloader. Available: 0.0.28
Failed to select device: Failed to connect to device, error message: X_LINK_DEVICE_NOT_FOUND
[2025-06-30T01:53:44Z ERROR re_viewer::depthai::depthai] Error: Failed to connect to device, error message: X_LINK_DEVICE_NOT_FOUND, Try to connect the device to
a different port.
Selecting device:
Selecting device: 194430105130781300
[2025-06-30 09:53:52.557] [depthai] [warning] [194430105130781300] [169.254.1.222] Flashed bootloader version 0.0.21, less than 0.0.28 is susceptible to bootup/r
estart failure. Upgrading is advised, flashing main/factory (not user) bootloader. Available: 0.0.28
Connecting to viewer at 127.0.0.1:9876
Oak cam: <depthai_sdk.oak_camera.OakCamera object at 0x0000014C840F2870>
Default stereo pair: (<CameraBoardSocket.CAM_B: 1>, <CameraBoardSocket.CAM_C: 2>)
Selecting device:
Resetting...
Closing device...
Done
Selecting device: 194430105130781300
[2025-06-30 09:54:12.838] [depthai] [warning] [194430105130781300] [169.254.1.222] Flashed bootloader version 0.0.21, less than 0.0.28 is susceptible to bootup/r
estart failure. Upgrading is advised, flashing main/factory (not user) bootloader. Available: 0.0.28
Failed to select device: Failed to connect to device, error message: X_LINK_DEVICE_NOT_FOUND
Pipeline config: auto=True cameras=[CameraConfiguration(fps=30, resolution=<CameraSensorResolution.THE_1080_P: 'THE_1080_P'>, kind=<CameraSensorType.COLOR: 0>,
board_socket=<CameraBoardSocket.CAM_A: 0>, stream_enabled=True, name='Color', tof_align=None, is_used_as_stereo_align=False), CameraConfiguration(fps=30, resolut
ion=<CameraSensorResolution.THE_400_P: 'THE_400_P'>, kind=<CameraSensorType.MONO: 1>, board_socket=<CameraBoardSocket.CAM_B: 1>, stream_enabled=False, name='Left
', tof_align=None, is_used_as_stereo_align=False), CameraConfiguration(fps=30, resolution=<CameraSensorResolution.THE_400_P: 'THE_400_P'>, kind=<CameraSensorType
.MONO: 1>, board_socket=<CameraBoardSocket.CAM_C: 2>, stream_enabled=False, name='Right', tof_align=None, is_used_as_stereo_align=False)] stereo=StereoDepthConfi
guration(depth_preset=<PresetMode.FACE: 3>, median=<MedianFilter.KERNEL_7x7: 7>, lr_check=True, lrc_threshold=5, extended_disparity=False, subpixel_disparity=Tru
e, align=<CameraBoardSocket.CAM_A: 0>, sigma=0, confidence=230, stereo_pair=(<CameraBoardSocket.CAM_B: 1>, <CameraBoardSocket.CAM_C: 2>)) ai_model=AiModelConfigu
ration(display_name='Yolo V6', path='yolov6nr3_coco_640x352', camera=<CameraBoardSocket.CAM_A: 0>) imu=ImuConfiguration(report_rate=100, batch_report_threshold=5
)
No device selected, can't update pipeline!
[2025-06-30T01:54:36Z ERROR re_viewer::depthai::depthai] Error: Failed to connect to device, error message: X_LINK_DEVICE_NOT_FOUND, Try to connect the device to
a different port.
[2025-06-30T01:54:43Z ERROR re_viewer::depthai::depthai] Error: No device selected, can't update pipeline!
Selecting device:
Selecting device:
Selecting device: 194430105130781300
Failed to select device: Failed to connect to device, error message: X_LINK_DEVICE_NOT_FOUND
[2025-06-30T01:55:09Z ERROR re_viewer::depthai::depthai] Error: Failed to connect to device, error message: X_LINK_DEVICE_NOT_FOUND, Try to connect the device to
a different port.
Selecting device:

jakaskerl

walawala111
Please update the device bootloader first - https://docs.luxonis.com/software-v3/depthai/depthai-components/bootloader/

Thanks,
Jaka

walawala111

jakaskerl
Thanks for your reply. This issue seems to be caused by a problem with my computer's network card driver.