Wating para conexão (netbeans-xdebug)

Question

Eu visitei vários howtos e experimentei todos eles - mas ainda assim recebo o temido 'Waiting for connection' no Netbeans. Aqui está uma foto do meu ambiente:

$ php -i

phpinfo()
PHP Version => 5.6.4-4ubuntu6

Build Date => Apr 17 2015 15:45:44
Server API => Command Line Interface
Virtual Directory Support => disabled
Configuration File (php.ini) Path => /etc/php5/cli
Loaded Configuration File => /etc/php5/cli/php.ini

This program makes use of the Zend Scripting Language Engine:
Zend Engine v2.6.0, Copyright (c) 1998-2014 Zend Technologies
with Xdebug v2.3.2, Copyright (c) 2002-2015, by Derick Rethans
with Zend OPcache v7.0.4-dev, Copyright (c) 1999-2014, by Zend Technologies
...

xdebug

xdebug support => enabled
Version => 2.3.2
IDE Key => netbeans-xdebug

Supported protocols => Revision
DBGp - Common DeBuGger Protocol => $Revision: 1.145 $

Directive => Local Value => Master Value
xdebug.auto_trace => Off => Off
xdebug.cli_color => 0 => 0
xdebug.collect_assignments => Off => Off
xdebug.collect_includes => On => On
xdebug.collect_params => 0 => 0
xdebug.collect_return => Off => Off
xdebug.collect_vars => Off => Off
xdebug.coverage_enable => On => On
xdebug.default_enable => On => On
xdebug.dump.COOKIE => no value => no value
xdebug.dump.ENV => no value => no value
xdebug.dump.FILES => no value => no value
xdebug.dump.GET => no value => no value
xdebug.dump.POST => no value => no value
xdebug.dump.REQUEST => no value => no value
xdebug.dump.SERVER => no value => no value
xdebug.dump.SESSION => no value => no value
xdebug.dump_globals => On => On
xdebug.dump_once => On => On
xdebug.dump_undefined => Off => Off
xdebug.extended_info => On => On
xdebug.file_link_format => no value => no value
xdebug.force_display_errors => Off => Off
xdebug.force_error_reporting => 0 => 0
xdebug.halt_level => 0 => 0
xdebug.idekey => netbeans-xdebug => netbeans-xdebug
xdebug.max_nesting_level => 256 => 256
xdebug.max_stack_frames => -1 => -1
xdebug.overload_var_dump => On => On
xdebug.profiler_aggregate => Off => Off
xdebug.profiler_append => Off => Off
xdebug.profiler_enable => Off => Off
xdebug.profiler_enable_trigger => Off => Off
xdebug.profiler_enable_trigger_value => no value => no value
xdebug.profiler_output_dir => /tmp => /tmp
xdebug.profiler_output_name => cachegrind.out.%p => cachegrind.out.%p
xdebug.remote_autostart => On => On
xdebug.remote_connect_back => Off => Off
xdebug.remote_cookie_expire_time => 3600 => 3600
xdebug.remote_enable => On => On
xdebug.remote_handler => dbgp => dbgp
xdebug.remote_host => 192.168.0.5 => 192.168.0.5
xdebug.remote_log => no value => no value
xdebug.remote_mode => req => req
xdebug.remote_port => 9000 => 9000
xdebug.scream => Off => Off
xdebug.show_exception_trace => Off => Off
xdebug.show_local_vars => Off => Off
xdebug.show_mem_delta => Off => Off
xdebug.trace_enable_trigger => Off => Off
xdebug.trace_enable_trigger_value => no value => no value
xdebug.trace_format => 0 => 0
xdebug.trace_options => 0 => 0
xdebug.trace_output_dir => /tmp => /tmp
xdebug.trace_output_name => trace.%c => trace.%c
xdebug.var_display_max_children => 128 => 128
xdebug.var_display_max_data => 512 => 512
xdebug.var_display_max_depth => 3 => 3

Meu /etc/php5/cli/php.ini segue:

zend_extension="/usr/lib/php5/20131226/xdebug.so"
xdebug.remote_autostart=on
xdebug.remote_enable=on
xdebug.remote_enable=1
xdebug.remote_handler="dbgp"
;xdebug.remote_host=127.0.0.1:81
xdebug.remote_host=192.168.0.5
;xdebug.remote_connect_back=1
xdebug.remote_port=9000
xdebug.remote_mode=req
xdebug.idekey="netbeans-xdebug"

$ sudo netstat -taupen

tcp   212534      0 192.168.0.5:34645       5.77.39.20:80           CLOSE_WAIT  1000       92048       19496/php 

192.168.0.5 é minha máquina local

$ telnet 192.168.0.5 9000

telnet: Unable to connect to remote host: Connection refused

$ sudo ufw status

Status: inactive

Ao pressionar o botão Debug Project no IDE e voltar ao terminal:

$ netstat -an | grep 9000

tcp6       0      0 :::9000                 :::*                    LISTEN 

E minha configuração do Netbeans:

Não há nada em meus logs de erro do PHP. Você pode deduzir o que estou fazendo de errado ou qual configuração eu perdi com as informações acima?

Obrigado antecipadamente

@rocky

Eu não acho que estou executando um firewall desde

$ sudo ufw status
Status: inactive

De qualquer forma:

$ sudo iptables --list 
Chain INPUT (policy ACCEPT)
target     prot opt source               destination         

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination         

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination 

que não é incrivelmente amigável?