nginx报错：connect() failed (111: Connection refused) while connecting to upstream

nginx错误日志有如下报错：
2021/06/21 14:24:47 [error] 12112#0: *7807990 connect() failed (111: Connection refused) while connecting to upstream, client: xx.xx.xx.xx, server: localhost, request: “GET /itms/cpe/cpe.listPage.action HTTP/1.1”, upstream: “http://[::1]:xxxx/itms/cpe/cpe.listPage.action”, host: “xx.xx.xx.xx:xxxx”, referrer: “http://xx.xx.xx.xx:xxxx/itms/index.menu.action”

我这里是nginx配置有问题，针对这种情况，解决方式如下：

ifconfig 查看 lo

::1 指的是本地ipv6地址

查看nginx配置
vim /usr/local/nginx/conf/nginx.conf
proxy_pass 中，如果配置的是localhost，就是转发到本地ipv4和ipv6，即报文章开头的错误。

改成127.0.0.1，不再有报错

改完重启nginx，
/usr/local/nginx/sbin/nginx -s reload

完毕。