[error] 2547571#2547571: *1971306 [client 172.31.***.***] ModSecurity: Access denied with code 400 (phase 2). Matched "Operator `Eq' with parameter `0' against variable `MULTIPART_STRICT_ERROR' (Value: `1' ) [file "/etc/nginx/conf/modsecurity.conf"] [line "59"]
sudo vim /etc/nginx/conf/modsecurity.conf
and comment all out for "MULTIPART_STRICT_ERROR" part. and
sudo systemctl restart nginx
@jason Thanks!! you saved my day.