Can not start debug session STM32CubeIDE (ST-Link, Nucleo-F767ZI)

[NikolaiB]

Hello all,

I get an error starting a debug session from STM32CubeIDE (1.18.1) (STM32 Nucleo-F767ZI):

STMicroelectronics ST-LINK GDB server. Version 7.10.0

Copyright (c) 2025, STMicroelectronics. All rights reserved.

Starting server with the following options:

Persistent Mode : Disabled

Logging Level : 1

Listen Port Number : 61234

Status Refresh Delay : 15s

Verbose Mode : Disabled

SWD Debug : Enabled

InitWhile : Enabled

Target USB comms error

Error in initializing ST-LINK device.

Reason: USB communication error. Please reconnect the ST-LINK USB cable and try again.

If I switch to SEGGER J-Link everythink works fine.

Is my debug configuration:

What I tried:
- Restart PC
- Reinstall the USB-Driver (https://www.st.com/en/development-tools/stsw-link009.html)
- Erased the flash with STM32CubeProgrammer
- Changes USB cable
- Googled for solutions

Please help

Best regards

Nikolai

[NikolaiB]

I switch between ST-Link and J-Link with the STLinkReflash-Tool. That works fine. If J-Link is flashed I can start a debug session from the STM32CubeIDE and from the SEGGER-Tools (Ozone, SystemView). But if I change to ST-Link, I get the error. 

[NikolaiB]

I tried it with version 2.0.0 of the STM32CobeIDE, but it didn't help. Same problem.

[NikolaiB]

All jumpers are default. I haven't changed anything.

[Andrew Neil]

Does CubeProgrammer connect OK?

Has this board ever worked for you?

More things to try here.

[Imen.D]

Hello @NikolaiB and welcome to the Community

Did you try reinstalling ST-LINK server software ?

Ensure debug pins (SWDIO, SWCLK) are not assigned to other signals.

Check also the option bytes for correct configuration.

Try to connect under reset mode.

[NikolaiB]

I can flash the ST-Link debug probe withe J-Link or ST-Link. If the J-Link firmware is running I can connect via the CubeProgrammer. Then erase or flash the MCU. If the ST-Link firmware is running on the debug probe, I have the described problem. But the CudeIDE detects the MCU!!!

[NikolaiB]

I have installed the ST-Link server. I see in the task manger that it is a 32Bit application. I have a 64 bit OS. Could that be a problem?

[NikolaiB]

I ganerate the code with CubeMX with default settings. As far as I can see the debug pins are ok. I habe link! When I start the debug session the LED LD4 switches from red to green and then comes the timeout.

[NikolaiB]

I tried 
- Hardware reset
- Software system reset
- Connect under reset

I have a connection, but I don't get any reply from the probe and then comes the timout.