Error localhost:61234: Connection timed out.

[ADębs.1]

Error in final launch sequence:

Failed to execute MI command:

target remote localhost:61234

Error message from debugger back end:

localhost:61234: Connection timed out.

Failed to execute MI command:

target remote localhost:61234

Error message from debugger back end:

localhost:61234: Connection timed out.

Why?

[MichalPorazko]

In my case it was just restarting the computer, I have windows 11 and CubeIDE 1.17.0

[CHRISTOS_PENOGLIDIS]

Had the same problem. When I connected both usb ports [one through ST-LINK\V3-SWD and one directly to other USB VCP it works!], when I disconnect USB VCP it does not work. Seems to be current/voltage related.

No CubeIDE reset helped. 

No Cubeprogrammer erase helped.

No PC restart helped.

No debugger server port reset helped.

Luckilly my board had two (2) usb ports => more current to put MCU in configuration mode!

[some other guy even connected pull up resistors, or SWD flying wires].

[Imen.D]

Hi @CHRISTOS_PENOGLIDIS , 

Please follow this article How to solve debugger connection issues.

Check Debug pins (SWDIO, SWCLK) are correctly configured.