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n8n - 💡(How to fix) Fix workflow started to fail a lot

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Error Message

Describe the problem/error/question

What is the error message (if any)?

[GoogleGenerativeAI Error]: Error fetching from https://generativelanguage.googleapis.com/v1beta/models/gemini-flash-latest:generateContent: [503 Service Unavailable] This model is currently experiencing high demand. Spikes in demand are usually temporary. Please try again later. "<!DOCTYPE html>\n<!--[if lt IE 7]> <html class="no-js ie6 oldie" lang="en-US"> <![endif]-->\n<!--[if IE 7]> <html class="no-js ie7 oldie" lang="en-US"> <![endif]-->\n<!--[if IE 8]> <html class="no-js ie8 oldie" lang="en-US"> <![endif]-->\n<!--[if gt IE 8]><!--> <html class="no-js" lang="en-US"> <!--<![endif]-->\n<head>\n\n<title>n8n.cloud | 524: A timeout occurred</title>\n<meta charset="UTF-8" />\n<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />\n<meta http-equiv="X-UA-Compatible" content="IE=Edge" />\n<meta name="robots" content="noindex, nofollow" />\n<meta name="viewport" content="width=device-width,initial-scale=1" />\n<link rel="stylesheet" id="cf_styles-css" href="/cdn-cgi/styles/main.css" />\n</head>\n<body>\n<div id="cf-wrapper">\n <div id="cf-error-details" class="p-0">\n <header class="mx-auto pt-10 lg:pt-6 lg:px-8 w-240 lg:w-full mb-8">\n <h1 class="inline-block sm:block sm:mb-2 font-light text-60 lg:text-4xl text-black-dark leading-tight mr-2">\n <span class="inline-block">A timeout occurred</span>\n <span class="code-label">Error code 524</span>\n </h1>\n <div>\n Visit <a href="https://www.cloudflare.com/5xx-error-landing?utm_source=errorcode_524&utm_campaign=eviatarweizman.app.n8n.cloud" target="_blank" rel="noopener noreferrer">cloudflare.com</a> for more information.\n </div>\n <div class="mt-3">2026-05-20 15:09:06 UTC</div>\n </header>\n <div class="my-8 bg-gradient-gray">\n <div class="w-240 lg:w-full mx-auto">\n <div class="clearfix md:px-8">\n <div id="cf-browser-status" class=" relative w-1/3 md:w-full py-15 md:p-0 md:py-8 md:text-left md:border-solid md:border-0 md:border-b md:border-gray-400 overflow-hidden float-left md:float-none text-center">\n <div class="relative mb-10 md:m-0">\n \n <span class="cf-icon-browser block md:hidden h-20 bg-center bg-no-repeat"></span>\n <span class="cf-icon-ok w-12 h-12 absolute left-1/2 md:left-auto md:right-0 md:top-0 -ml-6 -bottom-4"></span>\n \n </div>\n <span class="md:block w-full truncate">You</span>\n <h3 class="md:inline-block mt-3 md:mt-0 text-2xl text-gray-600 font-light leading-1.3">\n \n Browser\n \n </h3>\n \n <span class="leading-1.3 text-2xl text-green-success">Working</span>\n \n</div>\n <div id="cf-cloudflare-status" class=" relative w-1/3 md:w-full py-15 md:p-0 md:py-8 md:text-left md:border-solid md:border-0 md:border-b md:border-gray-400 overflow-hidden float-left md:float-none text-center">\n <div class="relative mb-10 md:m-0">\n <a href="https://www.cloudflare.com/5xx-error-landing?utm_source=errorcode_524&utm_campaign=eviatarweizman.app.n8n.cloud" target="_blank" rel="noopener noreferrer">\n <span class="cf-icon-cloud block md:hidden h-20 bg-center bg-no-repeat"></span>\n <span class="cf-icon-ok w-12 h-12 absolute left-1/2 md:left-auto md:right-0 md:top-0 -ml-6 -bottom-4"></span>\n </a>\n </div>\n <span class="md:block w-full truncate">Tel Aviv</span>\n <h3 class="md:inline-block mt-3 md:mt-0 text-2xl text-gray-600 font-light leading-1.3">\n <a href="https://www.cloudflare.com/5xx-error-landing?utm_source=errorcode_524&utm_campaign=eviatarweizman.app.n8n.cloud" target="_blank" rel="noopener noreferrer">\n Cloudflare\n </a>\n </h3>\n \n <span class="leading-1.3 text-2xl text-green-success">Working</span>\n \n</div>\n <div id="cf-host-status" class="cf-error-source relative w-1/3 md:w-full py-15 md:p-0 md:py-8 md:text-left md:border-solid md:border-0 md:border-b md:border-gray-400 overflow-hidden float-left md:float-none text-center">\n <div class="relative mb-10 md:m-0">\n \n <span class="cf-icon-server block md:hidden h-20 bg-center bg-no-repeat"></span>\n <span class="cf-icon-error w-12 h-12 absolute left-1/2 md:left-auto md:right-0 md:top-0 -ml-6 -bottom-4"></span>\n \n </div>\n <span class="md:block w-full truncate">eviatarweizman.app.n8n.cloud</span>\n <h3 class="md:inline-block mt-3 md:mt-0 text-2xl text-gray-600 font-light leading-1.3">\n \n Host\n \n </h3>\n \n <span class="leading-1.3 text-2xl text-red-error">Error</span>\n \n</div>\n </div>\n </div>\n </div>\n\n <div class="w-240 lg:w-full mx-auto mb-8 lg:px-8">\n <div class="clearfix">\n <div class="w-1/2 md:w-full float-left pr-6 md:pb-10 md:pr-0 leading-relaxed">\n <h2 class="text-3xl font-normal leading-1.3 mb-4">What happened?</h2>\n <p class="mb-2">The origin web server timed out responding to this request.</p><p>The likely cause is an overloaded background task, database or application, stressing the resources on the host web server.</p>\n </div>\n <div class="w-1/2 md:w-full float-left leading-relaxed">\n <h2 class="text-3xl font-normal leading-1.3 mb-4">What can I do?</h2>\n \n <h3 class="text-15 font-semibold mb-2">If you're a visitor of this website:</h3>\n <p class="mb-6">Please try again in a few minutes.</p>\n\n <h3 class="text-15 font-semibold mb-2">If you're the owner of this website:</h3>\n <p>Please refer to the <a rel="noopener noreferrer" href="https://developers.cloudflare.com/support/troubleshooting/http-status-codes/cloudflare-5xx-errors/error-524/">Error 524</a> article:</p>\n <ul class="ml-4">\n <li>Contact your hosting provider; check for long-running processes or an overloaded web server.</li>\n <li>Use status polling of large HTTP processes to avoid this error.</li>\n <li>Run the long-running scripts on a <a rel="noopener noreferrer" href="https://developers.cloudflare.com/dns/proxy-status/#dns-only-records">grey-clouded subdomain</a>.</li>\n <li>Enterprise customers can <a rel="noopener noreferrer" href="https://developers.cloudflare.com/support/troubleshooting/http-status-codes/cloudflare-5xx-errors/error-524/#resolution-on-cloudflare">increase the timeout setting</a> globally or for specific requests using Cache Rules.</li>\n </ul>\n </div>\n </div>\n </div>\n\n <div class="cf-error-footer cf-wrapper w-240 lg:w-full py-10 sm:py-4 sm:px-8 mx-auto text-center sm:text-left border-solid border-0 border-t border-gray-300">\n <p class="text-13">\n <span class="cf-footer-item sm:block sm:mb-1">Cloudflare Ray ID: <strong class="font-semibold">9fec3fa7aa2f163c</strong></span>\n <span class="cf-footer-separator sm:hidden">•</span>\n <span id="cf-footer-item-ip" class="cf-footer-item hidden sm:block sm:mb-1">\n Your IP:\n <button type="button" id="cf-footer-ip-reveal" class="cf-footer-ip-reveal-btn">Click to reveal</button>\n <span class="hidden" id="cf-footer-ip">87.70.137.137</span>\n <span class="cf-footer-separator sm:hidden">•</span>\n </span>\n <span class="cf-footer-item sm:block sm:mb-1"><span>Performance & security by</span> <a rel="noopener noreferrer" href="https://www.cloudflare.com/5xx-error-landing?utm_source=errorcode_524&utm_campaign=eviatarweizman.app.n8n.cloud" id="brand_link" target="_blank">Cloudflare</a></span>\n \n </p>\n <script>(function(){function d(){var b=a.getElementById("cf-footer-item-ip"),c=a.getElementById("cf-footer-ip-reveal");b&&"classList"in b&&(b.classList.remove("hidden"),c.addEventListener("click",function(){c.classList.add("hidden");a.getElementById("cf-footer-ip").classList.remove("hidden")}))}var a=document;document.addEventListener&&a.addEventListener("DOMContentLoaded",d)})();</script>\n </div><!-- /.error-footer -->\n\n </div>\n</div>\n</body>\n</html>"

  • error: all

Code Example

(Select the nodes on your canvas and use the keyboard shortcuts CMD+C/CTRL+C and CMD+V/CTRL+V to copy and paste the workflow.)
⚠️ WARNING ⚠️ If you have sensitive data in your workflow (like API keys), please remove it before sharing.
RAW_BUFFERClick to expand / collapse
<!-- Please follow the template below. Skip the questions that are not relevant to you. -->

Describe the problem/error/question

I have a chatbot workflow called "production google perplexity chatbot" that had been running reliably for some time, but starting today it began failing consistently.

The workflow now frequently returns "service unavailable" errors. In some cases, the execution is marked as successful, but the actual output is empty, for example: { "output": "" }

Additionally, I have noticed intermittent failures in the knowledge base nodes within this workflow. However, those same nodes execute correctly in a different workflow that points to the same data source, which makes the issue inconsistent and harder to diagnose.

What is the error message (if any)?

Problem in node ‘Knowledge Base‘ Service unavailable - try again later or consider setting this node to retry automatically (in the node settings)

and

Service unavailable - try again later or consider setting this node to retry automatically (in the node settings) [GoogleGenerativeAI Error]: Error fetching from https://generativelanguage.googleapis.com/v1beta/models/gemini-flash-latest:generateContent: [503 Service Unavailable] This model is currently experiencing high demand. Spikes in demand are usually temporary. Please try again later.

Please share your workflow/screenshots/recording

(Select the nodes on your canvas and use the keyboard shortcuts CMD+C/CTRL+C and CMD+V/CTRL+V to copy and paste the workflow.)
⚠️ WARNING ⚠️ If you have sensitive data in your workflow (like API keys), please remove it before sharing.

{ "nodes": [ { "parameters": { "modelName": "models/gemini-flash-latest", "options": { "temperature": 0.2 } }, "type": "@n8n/n8n-nodes-langchain.lmChatGoogleGemini", "typeVersion": 1, "position": [ -928, 464 ], "id": "ddcfac88-4fb0-4fc6-a708-c57da73bddda", "name": "Google Gemini Chat Model", "retryOnFail": true, "maxTries": 3, "waitBetweenTries": 2000, "credentials": { "googlePalmApi": { "id": "guPGyOnUAS2v6crE", "name": "n8n api key incpmai" } } } ], "connections": { "Google Gemini Chat Model": { "ai_languageModel": [ [] ] } }, "pinData": {}, "meta": { "instanceId": "291ec9456a92fea5d5976be252f308df9e94635b030bfa3fd5fe118344a5eead" } }

AND

{ "nodes": [ { "parameters": { "method": "POST", "url": "https://generativelanguage.googleapis.com/v1beta/models/gemini-2.5-flash:generateContent", "authentication": "genericCredentialType", "genericAuthType": "httpQueryAuth", "sendBody": true, "specifyBody": "json", "jsonBody": "={\n "contents": [\n {\n "parts": [\n { "text": "{{ $fromAI("query","the question the user needs an answer to") }}" }\n ]\n }\n ],\n "tools": [\n {\n "file_search": {\n "file_search_store_names": [\n "fileSearchStores/lscfincpmwebchatgincpmai-codrr7uttgxc"\n ]\n }\n }\n ]\n}\n", "options": {} }, "type": "n8n-nodes-base.httpRequestTool", "typeVersion": 4.3, "retryOnFail": true, "maxTries": 3, "waitBetweenTries": 2000, "position": [ -640, 464 ], "id": "69f703f5-3514-49a6-90dc-3dfdbf9d3867", "name": "Knowledge Base", "credentials": { "httpQueryAuth": { "id": "04CrMXQNsKQyj6VJ", "name": "gincpmai google" } } } ], "connections": { "Knowledge Base": { "ai_tool": [ [] ] } }, "pinData": {}, "meta": { "instanceId": "291ec9456a92fea5d5976be252f308df9e94635b030bfa3fd5fe118344a5eead" } }

Share the output returned by the last node

<!-- If you need help with data transformations, please also share your expected output. -->

"<!DOCTYPE html>\n<!--[if lt IE 7]> <html class="no-js ie6 oldie" lang="en-US"> <![endif]-->\n<!--[if IE 7]> <html class="no-js ie7 oldie" lang="en-US"> <![endif]-->\n<!--[if IE 8]> <html class="no-js ie8 oldie" lang="en-US"> <![endif]-->\n<!--[if gt IE 8]><!--> <html class="no-js" lang="en-US"> <!--<![endif]-->\n<head>\n\n<title>n8n.cloud | 524: A timeout occurred</title>\n<meta charset="UTF-8" />\n<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />\n<meta http-equiv="X-UA-Compatible" content="IE=Edge" />\n<meta name="robots" content="noindex, nofollow" />\n<meta name="viewport" content="width=device-width,initial-scale=1" />\n<link rel="stylesheet" id="cf_styles-css" href="/cdn-cgi/styles/main.css" />\n</head>\n<body>\n<div id="cf-wrapper">\n <div id="cf-error-details" class="p-0">\n <header class="mx-auto pt-10 lg:pt-6 lg:px-8 w-240 lg:w-full mb-8">\n <h1 class="inline-block sm:block sm:mb-2 font-light text-60 lg:text-4xl text-black-dark leading-tight mr-2">\n <span class="inline-block">A timeout occurred</span>\n <span class="code-label">Error code 524</span>\n </h1>\n <div>\n Visit <a href="https://www.cloudflare.com/5xx-error-landing?utm_source=errorcode_524&utm_campaign=eviatarweizman.app.n8n.cloud" target="_blank" rel="noopener noreferrer">cloudflare.com</a> for more information.\n </div>\n <div class="mt-3">2026-05-20 15:09:06 UTC</div>\n </header>\n <div class="my-8 bg-gradient-gray">\n <div class="w-240 lg:w-full mx-auto">\n <div class="clearfix md:px-8">\n <div id="cf-browser-status" class=" relative w-1/3 md:w-full py-15 md:p-0 md:py-8 md:text-left md:border-solid md:border-0 md:border-b md:border-gray-400 overflow-hidden float-left md:float-none text-center">\n <div class="relative mb-10 md:m-0">\n \n <span class="cf-icon-browser block md:hidden h-20 bg-center bg-no-repeat"></span>\n <span class="cf-icon-ok w-12 h-12 absolute left-1/2 md:left-auto md:right-0 md:top-0 -ml-6 -bottom-4"></span>\n \n </div>\n <span class="md:block w-full truncate">You</span>\n <h3 class="md:inline-block mt-3 md:mt-0 text-2xl text-gray-600 font-light leading-1.3">\n \n Browser\n \n </h3>\n \n <span class="leading-1.3 text-2xl text-green-success">Working</span>\n \n</div>\n <div id="cf-cloudflare-status" class=" relative w-1/3 md:w-full py-15 md:p-0 md:py-8 md:text-left md:border-solid md:border-0 md:border-b md:border-gray-400 overflow-hidden float-left md:float-none text-center">\n <div class="relative mb-10 md:m-0">\n <a href="https://www.cloudflare.com/5xx-error-landing?utm_source=errorcode_524&utm_campaign=eviatarweizman.app.n8n.cloud" target="_blank" rel="noopener noreferrer">\n <span class="cf-icon-cloud block md:hidden h-20 bg-center bg-no-repeat"></span>\n <span class="cf-icon-ok w-12 h-12 absolute left-1/2 md:left-auto md:right-0 md:top-0 -ml-6 -bottom-4"></span>\n </a>\n </div>\n <span class="md:block w-full truncate">Tel Aviv</span>\n <h3 class="md:inline-block mt-3 md:mt-0 text-2xl text-gray-600 font-light leading-1.3">\n <a href="https://www.cloudflare.com/5xx-error-landing?utm_source=errorcode_524&utm_campaign=eviatarweizman.app.n8n.cloud" target="_blank" rel="noopener noreferrer">\n Cloudflare\n </a>\n </h3>\n \n <span class="leading-1.3 text-2xl text-green-success">Working</span>\n \n</div>\n <div id="cf-host-status" class="cf-error-source relative w-1/3 md:w-full py-15 md:p-0 md:py-8 md:text-left md:border-solid md:border-0 md:border-b md:border-gray-400 overflow-hidden float-left md:float-none text-center">\n <div class="relative mb-10 md:m-0">\n \n <span class="cf-icon-server block md:hidden h-20 bg-center bg-no-repeat"></span>\n <span class="cf-icon-error w-12 h-12 absolute left-1/2 md:left-auto md:right-0 md:top-0 -ml-6 -bottom-4"></span>\n \n </div>\n <span class="md:block w-full truncate">eviatarweizman.app.n8n.cloud</span>\n <h3 class="md:inline-block mt-3 md:mt-0 text-2xl text-gray-600 font-light leading-1.3">\n \n Host\n \n </h3>\n \n <span class="leading-1.3 text-2xl text-red-error">Error</span>\n \n</div>\n </div>\n </div>\n </div>\n\n <div class="w-240 lg:w-full mx-auto mb-8 lg:px-8">\n <div class="clearfix">\n <div class="w-1/2 md:w-full float-left pr-6 md:pb-10 md:pr-0 leading-relaxed">\n <h2 class="text-3xl font-normal leading-1.3 mb-4">What happened?</h2>\n <p class="mb-2">The origin web server timed out responding to this request.</p><p>The likely cause is an overloaded background task, database or application, stressing the resources on the host web server.</p>\n </div>\n <div class="w-1/2 md:w-full float-left leading-relaxed">\n <h2 class="text-3xl font-normal leading-1.3 mb-4">What can I do?</h2>\n \n <h3 class="text-15 font-semibold mb-2">If you're a visitor of this website:</h3>\n <p class="mb-6">Please try again in a few minutes.</p>\n\n <h3 class="text-15 font-semibold mb-2">If you're the owner of this website:</h3>\n <p>Please refer to the <a rel="noopener noreferrer" href="https://developers.cloudflare.com/support/troubleshooting/http-status-codes/cloudflare-5xx-errors/error-524/">Error 524</a> article:</p>\n <ul class="ml-4">\n <li>Contact your hosting provider; check for long-running processes or an overloaded web server.</li>\n <li>Use status polling of large HTTP processes to avoid this error.</li>\n <li>Run the long-running scripts on a <a rel="noopener noreferrer" href="https://developers.cloudflare.com/dns/proxy-status/#dns-only-records">grey-clouded subdomain</a>.</li>\n <li>Enterprise customers can <a rel="noopener noreferrer" href="https://developers.cloudflare.com/support/troubleshooting/http-status-codes/cloudflare-5xx-errors/error-524/#resolution-on-cloudflare">increase the timeout setting</a> globally or for specific requests using Cache Rules.</li>\n </ul>\n </div>\n </div>\n </div>\n\n <div class="cf-error-footer cf-wrapper w-240 lg:w-full py-10 sm:py-4 sm:px-8 mx-auto text-center sm:text-left border-solid border-0 border-t border-gray-300">\n <p class="text-13">\n <span class="cf-footer-item sm:block sm:mb-1">Cloudflare Ray ID: <strong class="font-semibold">9fec3fa7aa2f163c</strong></span>\n <span class="cf-footer-separator sm:hidden">•</span>\n <span id="cf-footer-item-ip" class="cf-footer-item hidden sm:block sm:mb-1">\n Your IP:\n <button type="button" id="cf-footer-ip-reveal" class="cf-footer-ip-reveal-btn">Click to reveal</button>\n <span class="hidden" id="cf-footer-ip">87.70.137.137</span>\n <span class="cf-footer-separator sm:hidden">•</span>\n </span>\n <span class="cf-footer-item sm:block sm:mb-1"><span>Performance & security by</span> <a rel="noopener noreferrer" href="https://www.cloudflare.com/5xx-error-landing?utm_source=errorcode_524&utm_campaign=eviatarweizman.app.n8n.cloud" id="brand_link" target="_blank">Cloudflare</a></span>\n \n </p>\n <script>(function(){function d(){var b=a.getElementById("cf-footer-item-ip"),c=a.getElementById("cf-footer-ip-reveal");b&&"classList"in b&&(b.classList.remove("hidden"),c.addEventListener("click",function(){c.classList.add("hidden");a.getElementById("cf-footer-ip").classList.remove("hidden")}))}var a=document;document.addEventListener&&a.addEventListener("DOMContentLoaded",d)})();</script>\n </div><!-- /.error-footer -->\n\n </div>\n</div>\n</body>\n</html>"

Debug info

core

  • n8nVersion: 2.21.5
  • platform: docker (cloud)
  • nodeJsVersion: 24.15.0
  • nodeEnv: production
  • database: sqlite
  • executionMode: regular
  • concurrency: 5
  • license: enterprise (sandbox)

storage

  • success: all
  • error: all
  • progress: false
  • manual: true
  • binaryMode: filesystem

pruning

  • enabled: true
  • maxAge: 168 hours
  • maxCount: 2500 executions

client

  • userAgent: mozilla/5.0 (windows nt 10.0; win64; x64) applewebkit/537.36 (khtml, like gecko) chrome/148.0.0.0 safari/537.36
  • isTouchDevice: false

Generated at: 2026-05-20T15:03:57.010Z

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