Nginx Includes Not Loaded
Nginx include directives fail when file paths are incorrect.
Category archive
Nginx fixes
Published troubleshooting guides for nginx issues.
Nginx Config Reload Failed Syntax
Nginx configuration reload fails when syntax errors are present.
Nginx Error Log Too Verbose
Nginx error log fills disk when log level is set to debug in production.
Nginx Access Log Not Writing
Nginx access logs are not written when buffer is full or disk is full.
Nginx Limit Req Zone Key Wrong
Nginx rate limiting applies wrong key when variable is misconfigured.
Nginx Resolver IPv6 Not Working
Nginx cannot resolve IPv6 addresses when resolver is not configured for AAAA.
Nginx Upstream Keepalive Not Working
Nginx upstream keepalive connections are not reused when configuration is wrong.
Nginx Temp Path Permission Denied
Nginx cannot write to temp directories when permissions are incorrect.
Nginx Status Page Publicly Accessible
Nginx stub_status is accessible externally when not restricted by IP.
Nginx Autoindex Exposing Sensitive Files
Nginx autoindex exposes directory contents when enabled on sensitive paths.
Nginx Alias Directive Path Traversal
Nginx alias misconfiguration allows path traversal when trailing slash is wrong.
Nginx Variable Injection Vulnerability
Nginx configuration allows injection when variables are used unsafely.
Nginx SSL Buffer Size Insufficient
Nginx SSL records are truncated when ssl_buffer_size is too small.
Nginx SSL Session Cache Full
Nginx SSL session cache eviction causes handshake overhead when size is small.
Nginx Stream Module TCP Proxy Failed
Nginx stream TCP proxying fails when upstream is unreachable.
Nginx WebSocket Connection Closed
Nginx WebSocket connections drop when upgrade headers are not passed.
Nginx gRPC Upstream Not Working
Nginx gRPC proxying fails when HTTP2 is not enabled or content-type is wrong.
Nginx HTTP2 Push Not Working
Nginx HTTP2 server push does not work when link headers are wrong.
Nginx CORS Header Not Sent
Nginx CORS headers are missing when add_header is not in correct block.
Nginx CSP Header Blocking Resources
Nginx Content Security Policy blocks resources when directives are too strict.
Nginx HSTS Header Not Sent
Nginx HSTS header is not sent when add_header is in wrong context.
Nginx DH Param File Missing
Nginx Diffie-Hellman key exchange fails when dhparam file is not generated.
Nginx OCSP Stapling Validation Failed
Nginx OCSP stapling fails when responder is unreachable or certificate is revoked.
Nginx Lua Nginx API Blocking
Nginx Lua blocking calls cause worker to hang when yield is required.
Nginx Perl Module Not Loading
Nginx embedded Perl module fails to load when library path is wrong.
Nginx TryFiles Fallback Not Working
Nginx try_files fallback does not work when last parameter is wrong.
Nginx If Directive Not Evaluating
Nginx if directives behave unexpectedly due to rewrite phase evaluation.
Nginx Map Variable Not Defined
Nginx map variables return empty when default value is not set.
Nginx Log Buffering Lost Logs
Nginx buffered logs are lost when worker process crashes before flush.
Nginx Epoll Timeout High Latency
Nginx epoll timeout causes latency when timer resolution is not set.
Nginx Sendfile Not Working
Nginx sendfile transfer fails on network filesystems that do not support it.
Nginx AIO Not Improving Performance
Nginx asynchronous I/O does not improve performance when misconfigured.
Nginx Connection Tracking Table Full
Nginx connections are dropped when conntrack table is exhausted.
Nginx Rate Limiting Too Aggressive
Nginx rate limiting blocks legitimate traffic when burst is too small.
Nginx Sticky Session Not Working
Nginx upstream sticky sessions fail when cookie configuration is wrong.
Nginx DNS Resolution Failed
Nginx cannot resolve upstream hostnames when resolver is not configured.
Nginx Open File Descriptor Limit
Nginx cannot open more files when worker_rlimit_nofile is too low.
Nginx Caching Not Working
Nginx proxy cache does not store responses when cache directives are misconfigured.
Nginx Gzip Not Compressing
Nginx gzip compression is not applied when mime types are not configured.
Nginx Location Block Wrong Priority
Nginx location blocks match in unexpected order due to priority rules.
Nginx Rewrite Rule Not Matching
Nginx rewrite rules do not match when regex patterns are incorrect.
Nginx FastCGI Param Not Passed
Nginx FastCGI requests fail when required parameters are not configured.
Nginx Proxy Buffer Size Insufficient
Nginx proxy buffering fails when response headers exceed buffer size.
Nginx Upstream Server Unavailable
Nginx upstream server is marked unavailable after max_fails threshold.
Nginx Worker Connections Exhausted
Nginx cannot accept new connections when worker_connections limit is reached.
Nginx Certificate Chain Incomplete
Nginx certificate chain verification fails when intermediate certificates are missing.
Nginx SSL Handshake Failed
Nginx SSL handshake fails when certificate chain is incomplete or protocols mismatch.
Nginx 413 Request Entity Too Large
Nginx rejects large requests when client_max_body_size is too small.
Nginx 504 Gateway Timeout Upstream
Nginx returns 504 when upstream server does not respond within timeout period.
Nginx 502 Bad Gateway Upstream
Nginx returns 502 when upstream server is unavailable or returns invalid response.