Error launching openOCD debugger in Eclipse

Question

I am setting up openOCD and Eclipse on a new operating system, using a Nucleo F030R8 board that debugs fine on another system. When I run the debugger in Eclipse I get "error in final launch sequence":

Error in final launch sequence

Failed to execute MI command:

-target-select remote localhost:3333

Error message from debugger back end:

localhost:3333: No such file or directory.

Failed to execute MI command:

-target-select remote localhost:3333

Error message from debugger back end:

localhost:3333: No such file or directory.

localhost:3333: No such file or directory.

I can run the debugger in terminal with ./openocd -f board/st_nucleo_f0.cfg and get:

*GNU ARM Eclipse 64-bits Open On-Chip Debugger 0.9.0-00073-gdd34716 
(2015-05-19-12:55)

Licensed under GNU GPL v2

For bug reports, read

http://openocd.org/doc/doxygen/bugs.html

Info : The selected transport took over low-level target control. The results 
might differ compared to plain JTAG/SWD

adapter speed: 1000 kHz

adapter_nsrst_delay: 100

none separate

srst_only separate srst_nogate srst_open_drain connect_deassert_srst

Info : Unable to match requested speed 1000 kHz, using 950 kHz

Info : Unable to match requested speed 1000 kHz, using 950 kHz

Info : clock speed 950 kHz

Info : STLINK v2 JTAG v25 API v2 SWIM v13 VID 0x0483 PID 0x374B

Info : using stlink api v2

Info : Target voltage: 3.257369

Info : stm32f0x.cpu: hardware has 4 breakpoints, 2 watchpoints''*

and the LED LD1 blinks alternatively green and red. Similarly, I can run External Tools in Eclipse just fine, but this doesn't open the debugger. So it seems like I'm close, but something isn't quite right. Let me know if you need any other details of my system.

Using:

Eclipse Mars.2 (4.5.2)

Mac 10.12.1

OpenOCD 0.10.0-201601101000-dev

GNU Tools gcc-arm-none-eabi-5_4-2016q3

Answer 1

Ok so I figured it out with major credit due to http://www.carminenoviello.com. Running this in terminal:

>telnet localhost 3333
localhost: nodename nor servname provided, or not known

showed this wasn't working correctly. checking /etc/hosts, the file was empty. I changed it to:

##
# Host Database
#
# localhost is used to configure the loopback interface
# when the system is booting. Do not change this entry.
##
127.0.0.1 localhost
255.255.255.255 broadcasthost
::1 localhost

And that was that. Can now enter debug mode.