[error] 1382#0: *8 connect() failed (111: Connection refused) while connecting to upstream, client: 108.162.250.57, server: changed.com, request: “POST /wp-admin/admin-ajax.php HTTP/1.1”, upstream: "fastcgi://
or
2015/05/21 19:07:03 [error] 1382#0: *103 connect() failed (111: Connection refused) while connecting to upstream, client: 108.162.250.57, server: something.com, request: “POST /wp-admin/admin-ajax.php HTTP/1.1”, upstream: “fastcgi://127.0.0.1:8000”, host: “something.com”, referrer: “https://something.com/wp-admin/admin.php?page=jetpack”
that IP (108.162.250.57) is from cloudflare and something.com changed here for posting security
I get this after accessing jetpack for example