Error: couldn't bind tcl to socket: Address already in use when run openocd
When Try to run openocd -f interface/stlink-v2-1.cfg -f target/stm32f3x.cfg again it gives following error message in macOS (base) System:tmp adnan$ openocd -f interface/stlink-v2-1.cfg -f target/stm32f3x.cfg Open On-Chip Debugger 0.10.0 Licensed under GNU GPL v2 For bug reports, read http://openocd.org/doc/doxygen/bugs.html Info : auto-selecting first available session transport "hla_swd". To override use 'transport select <transport>'. adapter speed: 1000 kHz adapter_nsrst_delay: 100 Info : The selected transport took over low-level target control. The results might differ compared to plain JTAG/SWD none separate Error: couldn't bind tcl to socket: Address already in use Open terminal Get the list of used ports lsof -wni tcp:3333 OR lsof -nP -i4TCP:3333 | grep LISTEN The above command will show you PID using this port, now you can kill the process by the following command Kill them using PID kill -9 <PID>