Hi team,

Hope you all are doing well.

I need some assistance regarding nginx configuration. I am using nginx service 
as proxy_pass to other URL's

When I am performing load testing on nginx server with high no. of requests. 
For few tests it is running fine, But after some time it shows below upstream 
error message (5XX errors).

--------------------------------------------------------------------------------------------------------------------------------------------------------------------------
2019/05/07 04:20:38 [error] 18168#0: *684822 no live upstreams while connecting 
to upstream, client: XX.XX.XX.XX, server: _, request: "GET 
https://XXXXXXXXXXXXXXXXXXXXXX/XXXXXXXXXXXXXXXX/XXXXXXXXXXX/XXXXX HTTP/1.1", 
upstream: " https://XXXXXXXXXXXXXXXXXXXXXX/XXXXXXXXXXXXXXXX/XXXXXXXXXXX/XXXXX 
", host: " XXXXXXXXXXXXXXXXXX.XYZ.com "
2019/05/07 04:20:38 [error] 18168#0: *684820 connect() failed (110: Connection 
timed out) while connecting to upstream, client: XX.XX.XX.XX, server: _, 
request: "GET /XXXXXXXXXXXXXXXXXX/XXXXXXXXXXX/XXXXXXXXX/XXXXXXXXXXX HTTP/1.1", 
upstream: "https://XXXXXXXXXXXXXXXXXXXXXX/XXXXXXXXXXXXXXXX/XXXXXXXXXXX/XXXXX";, 
host: "XXXXXXXXXXXXXXXXXX.XYZ.com"
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------

After restarting nginx servers, it will again work fine. But this is not a 
proper solution.

Please someone help me to resolve this issue permanently. Let me know if any 
further details required from my side.


Vivek Solanki
CloudOps Engineer
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