nginx/nginx · error

NGX_LOG_EMERG

NGX_LOG_EMERG

Error message

duplicate listen options for %V

What it means

Error "duplicate listen options for %V" thrown in nginx/nginx.

Source

Thrown at src/stream/ngx_stream.c:492

        }

        /* preserve default_server bit during listen options overwriting */
        default_server = addr[i].opt.default_server;

        proxy_protocol = lsopt->proxy_protocol || addr[i].opt.proxy_protocol;
        protocols = lsopt->proxy_protocol;
        protocols_prev = addr[i].opt.proxy_protocol;

#if (NGX_STREAM_SSL)
        ssl = lsopt->ssl || addr[i].opt.ssl;
        protocols |= lsopt->ssl << 1;
        protocols_prev |= addr[i].opt.ssl << 1;
#endif

        if (lsopt->set) {

            if (addr[i].opt.set) {
                ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                   "duplicate listen options for %V",
                                   &addr[i].opt.addr_text);
                return NGX_ERROR;
            }

            addr[i].opt = *lsopt;
        }

        /* check the duplicate "default" server for this address:port */

        if (lsopt->default_server) {

            if (default_server) {
                ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                   "a duplicate default server for %V",
                                   &addr[i].opt.addr_text);
                return NGX_ERROR;
            }

View on GitHub (pinned to 3f6f7824d4)

When it happens

Trigger: Thrown at src/stream/ngx_stream.c:492 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of nginx/nginx@3f6f7824d4 (2026-08-22). Data as JSON: /api/errors/571799aff726d570. Report an issue: GitHub.