Ubuntu + php-fpm + nginx + unix socket = 13: Permission denied - php

Question

i can't make work nginx with php-fpm. Googled whole day, tried everything but no result.
Any request is 502 and in error log i see this:
# tail /var/log/**/*error*.log
==> /var/log/nginx/acme.www.error.log <==
2016/08/16 04:24:14 [crit] 930#930: *1 connect() to unix:/root/.phpbrew/php/php-5.6.24/var/run/php-fpm.sock failed (13: Permission denied) while connecting to upstream, client: 10.0.2.2, server: acme.dev, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/root/.phpbrew/php/php-5.6.24/var/run/php-fpm.sock:", host: "www.acme.dev:8080"
More tech info about my configuration here (it's almost default from repos):
# uname -a
Linux vagrant-ubuntu-trusty-64 3.13.0-93-generic #140-Ubuntu SMP Mon Jul 18 21:21:05 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
# php -v
PHP 5.6.24 (cli) (built: Aug 16 2016 02:28:22)
Copyright (c) 1997-2016 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies
with Xdebug v2.4.1, Copyright (c) 2002-2016, by Derick Rethans
# phpbrew fpm which
/root/.phpbrew/php/php-5.6.24/sbin/php-fpm
# /root/.phpbrew/php/php-5.6.24/sbin/php-fpm -v
PHP 5.6.24 (fpm-fcgi) (built: Aug 16 2016 02:28:29)
Copyright (c) 1997-2016 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies
with Xdebug v2.4.1, Copyright (c) 2002-2016, by Derick Rethans
# /root/.phpbrew/php/php-5.6.24/sbin/php-fpm -t
[16-Aug-2016 04:09:42] NOTICE: configuration file /root/.phpbrew/php/php-5.6.24/etc/php-fpm.conf test is successful
# cat /root/.phpbrew/php/php-5.6.24/etc/php-fpm.conf | egrep 'user|owner|group|mode'
user = www-data
group = www-data
listen.owner = www-data
listen.group = www-data
listen.mode = 0660
# nginx -v
nginx version: nginx/1.10.1
# cat /etc/nginx/nginx.conf | egrep 'user|owner|group|mode'
user www-data;
# cat /etc/nginx/snippets/fastcgi-php.conf | grep fastcgi_pass
fastcgi_pass unix:/root/.phpbrew/php/php-5.6.24/var/run/php-fpm.sock;
# fastcgi_pass unix:/root/.phpbrew/php/php-7.0.9/var/run/php-fpm.sock;
# nginx -t
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful
# date +%Y-%m-%d\ %H:%M:%S
2016-08-16 04:21:21
# ls -ahlFG /root/.phpbrew/php/php-5.6.24/var/run/php-fpm.sock
srw-rw---- 1 www-data 0 Aug 16 04:02 /root/.phpbrew/php/php-5.6.24/var/run/php-fpm.sock=
# getfacl /root/.phpbrew/php/php-5.6.24/var/run/php-fpm.sock
getfacl: Removing leading '/' from absolute path names
# file: root/.phpbrew/php/php-5.6.24/var/run/php-fpm.sock
# owner: www-data
# group: www-data
user::rw-
group::rw-
other::---
# groups nginx
nginx : nginx www-data
# groups www-data
www-data : www-data nginx
# ps aux | grep -F -e php -e nginx
root 2660 0.0 0.1 91500 1596 ? Ss 03:57 0:00 nginx: master process /usr/sbin/nginx -g daemon on; master_process on;
www-data 2661 0.1 0.3 92200 3612 ? SN 03:57 0:02 nginx: worker process
www-data 2662 0.0 0.3 92200 3120 ? SN 03:57 0:00 nginx: worker process
www-data 2664 0.1 0.3 92200 3612 ? SN 03:57 0:02 nginx: worker process
root 2712 0.0 1.0 251288 10276 ? Ss 04:02 0:00 php-fpm: master process (/root/.phpbrew/php/php-5.6.24/etc/php-fpm.conf)
www-data 2713 0.0 0.9 251288 9216 ? S 04:02 0:00 php-fpm: pool www
www-data 2714 0.0 0.9 251288 9216 ? S 04:02 0:00 php-fpm: pool www
root 3101 0.0 0.0 11920 788 pts/0 R+ 04:20 0:00 grep --color=auto -F -e php -e nginx
I'm lost with this and even don't know how to search where is error.
With php-7.0.9 – same error.