首先排查 ping 下 nginx 與代理服務是否ping 的通，帶端口的，telnet 下端口號是否是通的，本次遇到問題為 telnet 發現有台服務器不通，原因是端口未開放
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Nginx 報錯 connect() failed (110: Connection timed out) while connecting to upstream
nginx 超時問題: upstream timed out (110: Connection timed out) while reading response header from upstream
Nginx Upstream timed out (110: Connection timed out)
使用phpmailer插件發郵件失敗提示:SMTP -> ERROR: Failed to connect to server: Connection timed out (110) smtp connect（） failed；
Gradle sync failed: Connection timed out: connect
[nginx] 解決：upstream timed out (110: Connection timed out) while reading response header from upstream
nginx 報錯 upstream timed out (110: Connection timed out)解決方案
nginx 報錯 upstream timed out (110: Connection timed out)解決方案
cURL Error：Failed connect to *****.com:80; Connection timed out
次奧，這個必須要記一下……關於nginx錯誤110: Connection timed out