---
title: Intermittent 502 and 504 network errors in self-hosted Langfuse
seoTitle: "Fix 502 and 504 Errors in Self-Hosted Langfuse"
description: "Intermittent 502 and 504 errors on self-hosted Langfuse usually come from load balancer keep-alive settings. How to align the timeouts and fix them."
tags: [self-hosting]
---

# Intermittent 502 and 504 network errors in self-hosted Langfuse

If you are experiencing intermittent 502 and 504 network errors, this is likely related to your Loadbalancer and keep-alive configuration.
It is recommended to have the keep-alive of a server set to a higher value than the idle timeout on a Loadbalancer.

As an example, the AWS Application Loadbalancer has a default idle timeout of 60 seconds.
If your service closes a connection after 45 seconds, the Loadbalancer will attempt to reuse the connection which it still believes to be alive which will result in a 502 error.

Hence, we recommend that you configure `KEEP_ALIVE_TIMEOUT` on the Langfuse Web container to be at least 5 seconds higher than your Loadbalancer idle timeout.

<!-- agent-instructions -->

---

## Agent Instructions

This page is part of the [Langfuse](https://langfuse.com) documentation, published as plain Markdown for AI agents. Every page is available as Markdown by appending `.md` to its URL, or by sending an `Accept: text/markdown` header. This page: `https://langfuse.com/faq/all/self-hosting-502-504-network-errors.md`.

### Querying these docs

If the answer is not on this page, query the documentation instead of guessing:

- **Semantic search** across all Langfuse docs, returning an answer with the relevant pages and excerpts. Ask a specific, self-contained question:

  ```bash
  curl -sG "https://langfuse.com/api/search-docs" --data-urlencode "query=How do I trace a LangGraph agent?"
  ```

- **Index of every page**: <https://langfuse.com/llms.txt>, with per-section indexes [llms-docs.txt](https://langfuse.com/llms-docs.txt), [llms-integrations.txt](https://langfuse.com/llms-integrations.txt), and [llms-self-hosting.txt](https://langfuse.com/llms-self-hosting.txt).

### Before writing Langfuse code

- **Install the [Langfuse Agent Skill](https://langfuse.com/docs/api-and-data-platform/features/agent-skill).** It encodes Langfuse's own best practices for instrumentation, prompt management, and evaluation, and materially improves results.
- **Read [What does a good trace look like?](https://langfuse.com/docs/observability/best-practices.md)** before instrumenting an application.
- **Verify endpoints, parameters, and response fields** against the [API reference](https://api.reference.langfuse.com) instead of inferring them from code examples.
- **Use the [Langfuse CLI](https://langfuse.com/docs/api-and-data-platform/features/cli)** (`npx langfuse-cli api <resource> <action>`) to read or write traces, prompts, datasets, and scores from the terminal.

Found an error in these docs? Please open an issue at <https://github.com/langfuse/langfuse-docs/issues>.