config
Nginx all upstream servers marked down
no live upstreams while connecting to upstream
Fixes
- 1.Check health of upstream servers — all have failed health checks or max_fails threshold
- 2.Increase max_fails or fail_timeout to be more tolerant: server backend1 max_fails=5 fail_timeout=30s
- 3.Add more upstream servers for redundancy or set backup servers
nginxupstreamhealth-check
Related Errors
config3 fixes
Nginx 502 Bad Gateway - upstream unavailable
502 Bad Gateway|upstream prematurely closed connection
- •Verify the upstream server is running and listening on the expected address/port
- •Increase proxy_read_timeout and proxy_connect_timeout for slow backends
config3 fixes
Nginx 504 Gateway Timeout
504 Gateway Time-?out|upstream timed out.*reading response
- •Increase proxy_read_timeout (default 60s): proxy_read_timeout 300s
- •Optimize the backend endpoint that's taking too long to respond
config3 fixes
Nginx redirect loop
rewrite or internal redirection cycle|return 301.*too many redirects
- •Check for conflicting rewrite rules that redirect back and forth (HTTP→HTTPS→HTTP)
- •Use 'return 301' instead of 'rewrite' for simple redirects to avoid rule interaction