502 Bad Gateway nginx/1.10.3 (Ubuntu) after migrating Wordpress from another hosting

Hello, I have the same problem since 2 weeks on my droplet with all php installation am trying to run. I purged all nginx, php* then reinstall it again an set again all my vhost conf and it was working since yesterday… all my wordpress sites. But, am just coming to get the same problem now. My phpmyadmin new installation (after the previous apt purge) is a manualy installation with phpmyadmin archive: it brings me 502 too exactly like a phpinfo(); file . But any problem with Html site, on the sames vhost or not.

The /var/log/nginx/error.log last lines with me is:

2017/11/03 15:32:31 [error] 11344#11344: *8081 connect() to unix:/var/run/php/php7.0-fpm.sock failed (11: Resource temporarily unavailable) while connecting to upstream, client: 82.145.223.13, server: ubuntufacile.tk, request: $

I can deduct that it is realy a php-fpm communication failed.

So, I try to change the FastCgi request path wich was “/run/php/php7.0-fpm.sock” in the file /etc/php/7.0/fpm/pool.d/www-conf by "127.0.0.1:9000" and do the same with the fastcgi parameter in my vhosts conf files. Then, i reload php-fpm and nginx service and my sites are back again.

in the /etc/php/7.0/fpm/pool.d/www-conf: Comment this line with (;) prefixe

;listen = /run/php/php7.0-fpm.sock 

then add bellow

listen = 127.0.0.1:9000;

Then, in the site conf file, (/etc/nginx/sites-available/) Comment this line with (#) prefixe

#fastcgi_pass /var/run/php/php7.0-fpm.sock;

then add bellow the line

fastcgi_pass 127.0.0.1:9000;

I hope just it is fix for ever despite of an futur packages upgrade, because, i’d try the same method before without success, reason for my previous apt purge and reinstall. Although, i used a single different socket php-fpm pool for each site/vhost before have the trouble lastly. It worked kindly during several months.

Sorry for my english… I’m french speaker