LEMP Issue. PHP-FPM refusing connections.

[guiditoito]

I am getting a very weird problem with nginx and fpm. I am using vestacp on centos 7 but checked everything manually as well...
My client complained she's getting error 502 randomly when browsing her site and I found out I get them too eventually. I started checking the logs and found this on the nginx logs.

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 *180265 FastCGI sent in stderr: "usedPHP message: Connection refusedPHP message: Connection refusedPHP message: Connection refusedPHP message: Connection refusedPHP message: Connection refusedPHP message: Connection refusedPHP message: Connection refusedPHP message: Connection refusedPHP message: Connection refusedPHP message: Connection refusedPHP message: Connection refusedPHP message: Connection refusedPHP message: Connection refusedPHP message: Connection refusedPHP message: Connection refusedPHP message: Connection refusedPHP message: Connection refusedPHP message: Connection refusedPHP message: Connection refusedPHP message: Connection refusedPHP message: Connection refused

so I went ahead and did some research, changed fpm to sockets (vesta has it on port by default) but still nothing. changed php-fpm pm from ondemand to dynamic, and also nothing.

I get nothing on php-fpm's error log, so I hit a dead end. any ideas what I should try?