J-Link GDB debugging in CLion

Not long ago CLion added support for Remote GDB debugging and I'm trying to set it up with Seggers's J-Link GDB server.

My setup:

• VM VirtualBox running Ubuntu 16.04
• J-Link drivers: V6.10
• Target chip: nRF51 (ARM Cortex M0)
• CLion 2016.2.2

I usually work in windows, but as CLion doesn't support remote GDB in windows I'm trying to make it work running Ubuntu in VirtualBox. I configured the debugger in CLion like shown in the image with a little help from the blog in the link above. The arguments I have used are based on the J-Link documentation (Document: UM08001) and some guessing. GDB server setup

My problem is that when running the debugger the process just stops and CLion's console outputs:

"Could not connect to target. Please check power, connection and settings."

I have tried to run JLinkGDBServer from the terminal and then I get as far as this:

/usr/bin/JLinkGDBServer -device nrf51422_xxAC -if swd -speed 1000 -endian little
SEGGER J-Link GDB Server V6.10 Command Line Version

JLinkARM.dll V6.10 (DLL compiled Sep 14 2016 16:46:16)

-----GDB Server start settings-----
GDBInit file:                  none
GDB Server Listening port:     2331
SWO raw output listening port: 2332
Terminal I/O port:             2333
Accept remote connection:      yes
Generate logfile:              off
Verify download:               off
Init regs on start:            off
Silent mode:                   off
Single run mode:               off
Target connection timeout:     0 ms
------J-Link related settings------
J-Link Host interface:         USB
J-Link script:                 none
J-Link settings file:          none
------Target related settings------
Target device:                 nrf51422_xxAC
Target interface:              SWD
Target interface speed:        1000kHz
Target endian:                 little

Connecting to J-Link...
J-Link is connected.
Firmware: J-Link OB-SAM3U128-V2-NordicSemi compiled Jul  5 2016 08:42:09
Hardware: V1.00
S/N: 681666518
Checking target voltage...
Target voltage: 3.30 V
Listening on TCP/IP port 2331
Connecting to target...Connected to target
Waiting for GDB connection...

Does anyone have a clue of what I'm doing wrong?