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Intermittent 503 #16220

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opened 2026-02-21 19:25:09 -05:00 by yindo · 3 comments
yindo commented 2026-02-21 19:25:09 -05:00
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Originally created by @suxuanning on GitHub (Aug 17, 2025).

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  • I have read the Contributing Guide and Language Policy.
  • This is only for bug report, if you would like to ask a question, please head to Discussions.
  • I have searched for existing issues search for existing issues, including closed ones.
  • I confirm that I am using English to submit this report, otherwise it will be closed.
  • 【中文用户 & Non English User】请使用英语提交，否则会被关闭 ：）
  • Please do not modify this template :) and fill in all the required fields.

Dify version

1.7.2

Cloud or Self Hosted

Self Hosted (Docker)

Steps to reproduce

I always encounter intermittent 503 requests to external network interfaces, but I can confirm that there are no issues with the external network because when a 503 situation occurs, I use Postman to synchronize the requests. These intervals 503 always appear after a period of time, do not require additional processing, and automatically recover after a period of time

Image Image Image

✔️ Expected Behavior

No intermittent 503

❌ Actual Behavior

No response

Originally created by @suxuanning on GitHub (Aug 17, 2025). ### Self Checks - [x] I have read the [Contributing Guide](https://github.com/langgenius/dify/blob/main/CONTRIBUTING.md) and [Language Policy](https://github.com/langgenius/dify/issues/1542). - [x] This is only for bug report, if you would like to ask a question, please head to [Discussions](https://github.com/langgenius/dify/discussions/categories/general). - [x] I have searched for existing issues [search for existing issues](https://github.com/langgenius/dify/issues), including closed ones. - [x] I confirm that I am using English to submit this report, otherwise it will be closed. - [x] 【中文用户 & Non English User】请使用英语提交，否则会被关闭 ：） - [x] Please do not modify this template :) and fill in all the required fields. ### Dify version 1.7.2 ### Cloud or Self Hosted Self Hosted (Docker) ### Steps to reproduce I always encounter intermittent 503 requests to external network interfaces, but I can confirm that there are no issues with the external network because when a 503 situation occurs, I use Postman to synchronize the requests. These intervals 503 always appear after a period of time, do not require additional processing, and automatically recover after a period of time <img width="1458" height="79" alt="Image" src="https://github.com/user-attachments/assets/269ea63c-8e14-40e9-ada7-9f1f12c2d03c" /> <img width="1453" height="501" alt="Image" src="https://github.com/user-attachments/assets/7129a8e6-0921-4095-b1ef-31ca30eed3c7" /> <img width="503" height="611" alt="Image" src="https://github.com/user-attachments/assets/5dc92832-d846-4406-b688-8b0e1a9cee61" /> ### ✔️ Expected Behavior No intermittent 503 ### ❌ Actual Behavior _No response_
yindo added the 🌚 invalid label 2026-02-21 19:25:09 -05:00
yindo closed this issue 2026-02-21 19:25:09 -05:00
yindo commented 2026-02-21 19:25:10 -05:00
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@suxuanning commented on GitHub (Aug 17, 2025):

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@suxuanning commented on GitHub (Aug 17, 2025): <img width="1658" height="293" alt="Image" src="https://github.com/user-attachments/assets/43c1c4ee-f6cc-4c9a-9dc1-22b2585e76d8" />
yindo commented 2026-02-21 19:25:10 -05:00
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@dosubot[bot] commented on GitHub (Aug 17, 2025):

The intermittent 503 errors in self-hosted Dify (Docker) are often caused by resource exhaustion (especially Redis), backend service failures, or rate limiting. These issues can be triggered by high load, thread pool limits, or timeouts in network requests. Dify uses Python's ThreadPoolExecutor for parallel network operations, and exceptions like 503s are logged but not automatically retried—so recovery depends on the underlying service becoming available again, not on Dify itself self-healing source.

To troubleshoot and reduce these errors: check backend, frontend, and Docker logs for Redis errors or rate limiting; monitor Redis container health and memory; review your docker-compose.yml and environment variables for CORS and API URL settings; and watch CPU, memory, and thread usage in all containers. If you see 503s when accessing internal URLs, add an extra_hosts mapping for the internal domain in the ssrf_proxy service in your docker-compose.yaml and restart the containers source.

Timeouts for external network requests are configurable via environment variables (see dify_config), and you can tune thread pool sizes for retrieval services. For production, consider adding retry logic with exponential backoff and jitter for transient 503s, and set appropriate timeouts to avoid resource exhaustion source.

A recent PR also addressed a related 504 timeout issue, so updating to the latest version may help if you haven't already source.

To reply, just mention @dosu.

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@dosubot[bot] commented on GitHub (Aug 17, 2025): <!-- Answer --> The intermittent 503 errors in self-hosted Dify (Docker) are often caused by resource exhaustion (especially Redis), backend service failures, or rate limiting. These issues can be triggered by high load, thread pool limits, or timeouts in network requests. Dify uses Python's ThreadPoolExecutor for parallel network operations, and exceptions like 503s are logged but not automatically retried—so recovery depends on the underlying service becoming available again, not on Dify itself self-healing [source](https://github.com/langgenius/dify/issues/22235). To troubleshoot and reduce these errors: check backend, frontend, and Docker logs for Redis errors or rate limiting; monitor Redis container health and memory; review your docker-compose.yml and environment variables for CORS and API URL settings; and watch CPU, memory, and thread usage in all containers. If you see 503s when accessing internal URLs, add an `extra_hosts` mapping for the internal domain in the `ssrf_proxy` service in your docker-compose.yaml and restart the containers [source](https://github.com/langgenius/dify/issues/22612). Timeouts for external network requests are configurable via environment variables (see `dify_config`), and you can tune thread pool sizes for retrieval services. For production, consider adding retry logic with exponential backoff and jitter for transient 503s, and set appropriate timeouts to avoid resource exhaustion [source](https://github.com/langgenius/dify/issues/11636). A recent PR also addressed a related 504 timeout issue, so updating to the latest version may help if you haven't already [source](https://github.com/langgenius/dify/pull/23961). <!-- Dosu Comment Footer --> *To reply, just mention [@dosu](https://go.dosu.dev/dosubot).* --- <sup>How did I do? [Good](https://app.dosu.dev/response-feedback/e4f0c7a8-cb64-46fc-8e4c-bfac6d03d7ea?feedback_type=great_response) | [Irrelevant](https://app.dosu.dev/response-feedback/e4f0c7a8-cb64-46fc-8e4c-bfac6d03d7ea?feedback_type=irrelevant_answer) | [Incorrect](https://app.dosu.dev/response-feedback/e4f0c7a8-cb64-46fc-8e4c-bfac6d03d7ea?feedback_type=incorrect_sources) | [Verbose](https://app.dosu.dev/response-feedback/e4f0c7a8-cb64-46fc-8e4c-bfac6d03d7ea?feedback_type=too_verbose) | [Hallucination](https://app.dosu.dev/response-feedback/e4f0c7a8-cb64-46fc-8e4c-bfac6d03d7ea?feedback_type=hallucination) | [Report 🐛](https://app.dosu.dev/response-feedback/e4f0c7a8-cb64-46fc-8e4c-bfac6d03d7ea?feedback_type=bug_report) | [Other](https://app.dosu.dev/response-feedback/e4f0c7a8-cb64-46fc-8e4c-bfac6d03d7ea?feedback_type=other)</sup>&nbsp;&nbsp;[![Chat with Dosu](https://dosu.dev/dosu-chat-badge.svg)](https://app.dosu.dev/6088a4f4-073a-43f3-b3d4-4f06fb0c05a0/ask?utm_source=github)&nbsp;[![Join Discord](https://img.shields.io/badge/join-5865F2?logo=discord&logoColor=white&label=)](https://go.dosu.dev/discord-bot)&nbsp;[![Share on X](https://img.shields.io/badge/X-share-black)](https://twitter.com/intent/tweet?text=%40dosu_ai%20helped%20me%20solve%20this%20issue!&url=https%3A//github.com/langgenius/dify/issues/24064)
yindo commented 2026-02-21 19:25:10 -05:00
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@crazywoola commented on GitHub (Aug 17, 2025):

Please check your HTTP services instead. 503 is returned by the service not us.

@crazywoola commented on GitHub (Aug 17, 2025): Please check your HTTP services instead. 503 is returned by the service not us.
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Reference: langgenius/dify#16220
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