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failed (13: Permission denied) while reading upstream - 9 years ago

hello all. I need help with this issue: tail -n 7 /var/log/nginx/log 2015/03/14 02:11:36 4138#0: *1338 open() "/var/lib/nginx/fastcgi/6/18/0000000186" failed (13: Permission denied) while reading upstream, client: 88.23.59.219, server: localhost, request: "GET /apamcyl/wp-admin/customize.php?save=Guardar+y+publicar HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000"