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A 502 Bad Gateway after an ELK installation means the gateway—often Nginx, an ingress controller, or a load balancer—could not obtain a valid response from the upstream service. The fastest fix is to test each hop directly, starting with Kibana, then Elasticsearch, and only then the proxy. This separates a Kibana startup problem from a wrong upstream address, TLS mismatch, path error, version conflict, or timeout.
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What a 502 means in an ELK deployment
The browser is reporting a failure at the gateway layer, not necessarily at Kibana itself. A proxy returns 502 when its upstream connection is refused, closes unexpectedly, speaks the wrong protocol, presents an unacceptable TLS certificate, or returns a response the proxy cannot use. In a typical installation, the request path is:
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browser Nginx/load balancer/ingress Kibana ElasticsearchThere may also be a separate path from Logstash to an HTTP endpoint. Identify which hop produced the error before changing settings. A 502 on the Kibana landing page points first to the proxy-to-Kibana hop; a 502 only while opening Discover or running a search can indicate a proxy-to-Elasticsearch failure instead.
Run this triage sequence first
- Request Kibana directly on its configured HTTP address and port.
- Inspect Kibana startup and readiness logs.
- From the Kibana host, test the configured Elasticsearch URL, authentication, and TLS trust.
- Confirm every Elastic Stack component uses the same release version.
- Check the proxy’s upstream host, port, scheme, headers, path handling, and timeouts.
- If only search or Discover fails, trace the Elasticsearch-facing proxy route separately.
- If Logstash sends HTTP events, inspect its retry, proxy, timeout, and TLS settings independently.
Do not start by increasing proxy timeouts or disabling certificate verification. Those changes can hide the actual fault and weaken security.
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1. Check whether Kibana is ready
Kibana’s default HTTP port is 5601, although local configuration can change it. Test from the Kibana machine first so the result is not affected by Nginx or a load balancer:
curl -i http://127.0.0.1:5601/status
curl -sS http://127.0.0.1:5601/api/statusThe /status endpoint is useful for a quick HTTP response. The JSON endpoint exposes overall status and core-plugin health, making it easier to tell whether Kibana is still initializing, degraded, or ready. Replace 127.0.0.1 and the port when Kibana listens on another interface or port.
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- Connection refused or no route: Kibana is stopped, listening elsewhere, blocked locally, or still starting.
- A readiness or initialization response: Kibana is alive but not ready to serve normal traffic. Wait while checking logs rather than treating the proxy as the cause.
- A healthy status directly, but 502 through Nginx: Focus on the proxy upstream address, protocol, certificate verification, headers, path, and timeout.
- An HTTPS error when you used HTTP, or the reverse: Match the test scheme to Kibana’s configured listener.
Test the exact address configured for the proxy as well as loopback. A service can answer on localhost while refusing connections from the proxy’s network address because of its bind setting or a firewall.
2. Read Kibana’s logs before changing configuration
Use the service manager and Kibana’s configured log destination to inspect the period immediately after startup. On a systemd installation, a typical first check is:
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sudo systemctl status kibana
sudo journalctl -u kibana --since "15 minutes ago"
Use the equivalent command for your init system or container runtime. Look for Elasticsearch connection failures, authentication errors, certificate or hostname verification failures, migration messages, plugin exceptions, and bind or port errors.
Elastic’s Kibana troubleshooting material covers server logs, readiness errors, Elasticsearch query tracing, monitoring, migrations, alerts, and diagnostic collection. Configuration or plugin changes can make Kibana spend longer re-optimizing browser resources during startup; a temporary gateway error during that interval does not prove the installation is broken. Persistent 502 responses after the direct status API becomes healthy point back to the gateway.
3. Verify Elasticsearch from the Kibana host
Kibana must be able to reach the Elasticsearch URL in its configuration. The documented default Elasticsearch HTTP port is 9200; the transport port is 9300. The transport port is not the REST endpoint Kibana uses. Both values can be overridden locally.
curl -i http://elasticsearch-host:9200/
curl -i -u 'user:password' https://elasticsearch-host:9200/Use the same scheme, hostname, port, credentials, and certificate chain configured for Kibana. A response such as an authentication failure demonstrates network reachability but identifies a credentials or permissions problem. A name-resolution error, timeout, or connection refusal indicates a network, firewall, service, or address problem. With HTTPS, verify that the Kibana host trusts the issuing CA and that the certificate name matches the hostname used in the URL.
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- Confirm Elasticsearch is running and listening on the expected interface.
- Check host firewalls, cloud security groups, container networks, and ingress rules.
- Make sure the URL does not point to an old node, an unreachable private address, or a port used by another service.
- Check Elasticsearch logs when the connection reaches the service but requests are rejected or closed.
4. Align every Elastic Stack version
Elastic’s deployment guidance requires the same version across the entire stack. Elasticsearch, Kibana, Logstash, Beats, and APM components should be on one release line. A mixed installation can leave Kibana unable to complete migrations or use APIs that the Elasticsearch server does not provide, producing symptoms that look like proxy failures.
| Component | What to verify | Why it matters |
|---|---|---|
| Elasticsearch | Package or container release and node compatibility | It is Kibana’s primary backend and migration target. |
| Kibana | Exactly the same release as Elasticsearch | Kibana startup and saved-object migrations depend on compatible APIs. |
| Logstash | Same stack release where required by the deployment | Output plugins and API behavior can differ between releases. |
| Beats and APM | Match the stack release used by the deployment | Agents and servers may reject incompatible protocol or index templates. |
Correct package or image tags and complete the supported upgrade or downgrade procedure before diagnosing Nginx. Do not solve a version mismatch by repeatedly restarting the proxy.
5. Inspect the reverse-proxy upstream
When Kibana’s direct status endpoint is healthy, inspect the gateway configuration and its error log. For Nginx, validate the configuration before reloading it:
sudo nginx -t
sudo tail -n 100 /var/log/nginx/error.logCheck each of these values against the address where Kibana actually listens:
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| Setting | Failure pattern | What to do |
|---|---|---|
| Upstream hostname | DNS resolves to the wrong host, an obsolete container, or an unreachable private address | Resolve the name from the proxy host and test the result directly. |
| Upstream port | Proxy targets 5601 while Kibana uses a custom port, or targets Elasticsearch’s port by mistake | Use Kibana’s actual HTTP listener for browser traffic. |
| Scheme | Nginx speaks HTTP to an HTTPS listener, or HTTPS to plain HTTP | Match http:// or https:// to Kibana’s listener. |
| Certificate verification | HTTPS handshake fails because the proxy lacks the CA or the name is wrong | Install the correct trust chain and use a hostname covered by the certificate. |
| Host and forwarding headers | Kibana builds incorrect links, rejects the host, or mishandles secure cookies | Pass the intended host and the appropriate forwarding scheme and client-IP headers. |
| Connect and read timeouts | Slow startup or long-running requests are cut off by the gateway | Increase limits only after confirming the upstream is reachable and genuinely slow. |
Read the proxy error line carefully. Messages such as connection refused, upstream timed out, no live upstreams, and SSL handshake failure identify different repairs. Check the proxy’s name resolution and route from the proxy machine, not only from your workstation.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.6. Handle root paths, subpaths, and server.basePath
A proxy can reach a healthy Kibana process and still fail when it rewrites the URL incorrectly. Decide whether users access Kibana at the domain root, such as https://logs.example/, or under a subpath, such as https://example/logs/. For a subpath, Kibana’s server.basePath, the proxy location rule, and any setting that controls whether Kibana includes the base path in generated URLs must agree.
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- Request the same path through the proxy that users open in their browser.
- Check for a missing or duplicated slash when the proxy strips or preserves a prefix.
- Inspect redirects and asset URLs in the response; links that jump from a subpath to the domain root indicate inconsistent base-path handling.
- Keep the proxy’s location and Kibana’s base-path configuration synchronized after every change, then restart or reload the affected service as required.
Do not use a subpath workaround to conceal an upstream port or TLS error. A direct request to Kibana must be healthy first.
7. Separate Kibana 502s from Elasticsearch 502s
Not every 502 displayed inside the Kibana interface came from the browser-to-Kibana connection. If the home page loads but Discover, dashboards, or searches fail, Kibana may be running while a proxy route to Elasticsearch is failing. Trace the request in the browser’s network panel and correlate its timestamp with gateway and Elasticsearch logs.
| Observed behavior | Most likely hop | First evidence to collect |
|---|---|---|
| Entire Kibana page returns 502 | Gateway to Kibana | Direct Kibana status API and proxy upstream error. |
| Page loads; searches fail | Kibana to Elasticsearch, or a separate Elasticsearch proxy path | Failed request URL, proxy log, Elasticsearch response and log. |
| Only one data view or dashboard fails | Elasticsearch query, permissions, or index condition | HTTP status and response body for that request. |
Elastic community guidance for Elasticsearch-side failures recommends checking proxy logs when Elasticsearch is the server handling the failed request. Preserve the original status and response body; replacing every error with a generic 502 makes the failing hop harder to identify.
8. Check Logstash HTTP output separately
If your ELK design includes Logstash sending events over HTTP, its failures are a different diagnostic path from a browser request to Kibana. The HTTP output plugin documents 429, 500, 502, 503, and 504 as retryable responses when retry_failed is enabled. It also has its own proxy, socket-timeout, and TLS settings.
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- Check whether the destination requires a proxy and whether the plugin is configured to use it.
- Verify CA trust, client certificates, hostname validation, and credentials for HTTPS.
- Review Logstash logs for retries, exhausted timeouts, and response codes.
- Do not treat a retryable Logstash 502 as evidence that Kibana caused the browser’s 502.
When startup delay is the actual cause
A new Kibana instance can be unavailable while it performs migrations, initializes plugins, or re-optimizes browser resources after a plugin or setting change. During this window, a proxy may report 502 or 503 depending on its behavior. Use the status API and logs to establish whether readiness is progressing. If the status becomes healthy and the proxy then works, avoid permanent configuration changes; instead, configure deployment health checks and startup handling so traffic is not sent to Kibana before readiness.
If readiness never completes, treat the log’s first substantive error as the cause. Repeated restarts can extend migrations and destroy the timing context needed to diagnose them.
Redact diagnostics before sharing them
Elastic warns that diagnostic output can include product metadata and settings. Before posting a log, configuration excerpt, status response, or screen capture, remove passwords, API keys, bearer tokens, cookie values, private hostnames, internal IP addresses, certificate private material, and identifying environment details. Keep the error class, timestamp, affected URL path, status code, and relevant version numbers so another administrator can reproduce the reasoning without receiving secrets.
A practical stop condition
You have found the correct layer when the direct service test, the corresponding log entry, and the proxy error agree. For example, a healthy Kibana JSON status plus an Nginx “connection refused” message for the wrong port is a proxy-address repair; a failed Elasticsearch TLS handshake in Kibana’s log is an Elasticsearch trust or hostname repair; a healthy stack with mixed release versions requires version correction before proxy tuning. Fix that layer, retest the direct endpoint, then retest through the gateway.
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