The session "{ID}" is not registered. Workflow frozen

RazvanTinca · April 4, 2024, 5:24pm

Describe the problem/error/question

The testing environment of n8n is not working. I’ve tried to use the n8n Form Trigger and created a dummy input field. When running the workflow on the testing environment, it returns an error The session "{ID}" is not registered. in the console, and the node prompts that it’s still listening, Even If the form said that it was submitted, it doesn’t go to the next step.

What is the error message (if any)?

n8n-n8n-1  | User settings loaded from: /root/.n8n/config
n8n-n8n-1  | 2024-04-04T17:10:28.911Z | info     | Initializing n8n process "{ file: 'start.js', function: 'init' }"
n8n-n8n-1  | 2024-04-04T17:10:29.128Z | debug    | Lazy Loading credentials and nodes from n8n-nodes-base "{\n  credentials: 352,\n  nodes: 445,\n  file: 'LoggerProxy.js',\n  function: 'exports.debug'\n}"
n8n-n8n-1  | 2024-04-04T17:10:29.144Z | debug    | Lazy Loading credentials and nodes from @n8n/n8n-nodes-langchain "{\n  credentials: 14,\n  nodes: 70,\n  file: 'LoggerProxy.js',\n  function: 'exports.debug'\n}"
n8n-n8n-1  | n8n ready on 0.0.0.0, port 5678
n8n-n8n-1  | 2024-04-04T17:10:29.279Z | debug    | [license] initializing for deviceFingerprint 40c2277a3b0bfd1b9ee6daab29967e8ab0fbd2342cab329e863907bc13ebe6d4 "{ file: 'LicenseManager.js', function: 'log' }"
n8n-n8n-1  | 2024-04-04T17:10:29.286Z | debug    | [license] attempting license renewal "{ file: 'LicenseManager.js', function: 'log' }"
n8n-n8n-1  | 2024-04-04T17:10:29.288Z | debug    | Orchestration init complete "{ file: 'start.js', function: 'init' }"
n8n-n8n-1  | 2024-04-04T17:10:29.291Z | debug    | Binary data service init complete "{ file: 'start.js', function: 'init' }"
n8n-n8n-1  | 2024-04-04T17:10:29.292Z | debug    | External hooks init complete "{ file: 'start.js', function: 'init' }"
n8n-n8n-1  | 2024-04-04T17:10:29.294Z | debug    | External secrets init complete "{ file: 'start.js', function: 'init' }"
n8n-n8n-1  | 2024-04-04T17:10:29.295Z | debug    | Workflow history init complete "{ file: 'start.js', function: 'init' }"
n8n-n8n-1  | 2024-04-04T17:10:30.532Z | debug    | Wait tracker querying database for waiting executions "{ file: 'WaitTracker.js', function: 'getWaitingExecutions' }"
n8n-n8n-1  | 2024-04-04T17:10:30.827Z | debug    | Initializing event bus... "{ file: 'MessageEventBus.js', function: 'initialize' }"
n8n-n8n-1  | 2024-04-04T17:10:30.830Z | debug    | Initializing event writer "{ file: 'MessageEventBus.js', function: 'initialize' }"
n8n-n8n-1  | 2024-04-04T17:10:30.834Z | debug    | Checking for unsent event messages "{ file: 'MessageEventBus.js', function: 'initialize' }"
n8n-n8n-1  | 2024-04-04T17:10:30.865Z | debug    | Start logging into /root/.n8n/n8nEventLog.log  "{ file: 'MessageEventBus.js', function: 'initialize' }"
n8n-n8n-1  | 2024-04-04T17:10:30.868Z | debug    | MessageEventBus initialized "{ file: 'MessageEventBus.js', function: 'initialize' }"
n8n-n8n-1  | Version: 1.34.2
n8n-n8n-1  | 2024-04-04T17:10:30.869Z | debug    | Server ID: main-wny2zrvS8OxFhVJW "{ file: 'Server.js', function: 'start' }"
n8n-n8n-1  | 2024-04-04T17:10:30.872Z | debug    | [Pruning] Starting soft-deletion and hard-deletion timers "{ file: 'pruning.service.js', function: 'startPruning' }"
n8n-n8n-1  | 2024-04-04T17:10:30.873Z | debug    | [Pruning] Soft-deletion scheduled every 60 min "{ file: 'pruning.service.js', function: 'setSoftDeletionInterval' }"
n8n-n8n-1  | 2024-04-04T17:10:30.873Z | debug    | [Pruning] Hard-deletion scheduled for next 15 min "{ file: 'pruning.service.js', function: 'scheduleHardDeletion' }"
n8n-n8n-1  |
n8n-n8n-1  | Editor is now accessible via:
n8n-n8n-1  | http://localhost:5678/
n8n-n8n-1  | 2024-04-04T17:10:40.292Z | verbose  | Execution for workflow My workflow was assigned id 4 "{\n  executionId: '4',\n  file: 'WorkflowRunner.js',\n  function: 'runMainProcess'\n}"
n8n-n8n-1  | 2024-04-04T17:10:40.302Z | debug    | Executing hook (hookFunctionsPush) "{\n  executionId: '4',\n  sessionId: '2slvnpiyjkj',\n  workflowId: 'ndClDVcBNOtmySlG',\n  file: 'WorkflowExecuteAdditionalData.js',\n  function: 'workflowExecuteBefore'\n}"
n8n-n8n-1  | 2024-04-04T17:10:40.303Z | error    | The session "2slvnpiyjkj" is not registered. "{\n  sessionId: '2slvnpiyjkj',\n  file: 'abstract.push.js',\n  function: 'sendToOneSession'\n}"
n8n-n8n-1  | 2024-04-04T17:10:40.303Z | debug    | Execution ID 4 had Execution data. Running with payload. "{\n  executionId: '4',\n  file: 'WorkflowRunner.js',\n  function: 'runMainProcess'\n}"
n8n-n8n-1  | 2024-04-04T17:10:40.305Z | verbose  | Workflow execution started "{\n  workflowId: 'ndClDVcBNOtmySlG',\n  file: 'LoggerProxy.js',\n  function: 'exports.verbose'\n}"
n8n-n8n-1  | 2024-04-04T17:10:40.310Z | debug    | Start processing node "n8n Form Trigger" "{\n  node: 'n8n Form Trigger',\n  workflowId: 'ndClDVcBNOtmySlG',\n  file: 'LoggerProxy.js',\n  function: 'exports.debug'\n}"
n8n-n8n-1  | 2024-04-04T17:10:40.327Z | debug    | Executing hook on node "n8n Form Trigger" (hookFunctionsPush) "{\n  executionId: '4',\n  sessionId: '2slvnpiyjkj',\n  workflowId: 'ndClDVcBNOtmySlG',\n  file: 'WorkflowExecuteAdditionalData.js',\n  function: 'nodeExecuteBefore'\n}"
n8n-n8n-1  | 2024-04-04T17:10:40.335Z | error    | The session "2slvnpiyjkj" is not registered. "{\n  sessionId: '2slvnpiyjkj',\n  file: 'abstract.push.js',\n  function: 'sendToOneSession'\n}"
n8n-n8n-1  | 2024-04-04T17:10:40.341Z | verbose  | Started execution of workflow "My workflow" from webhook with execution ID 4 "{\n  executionId: '4',\n  file: 'WebhookHelpers.js',\n  function: 'executeWebhook'\n}"
n8n-n8n-1  | 2024-04-04T17:10:40.343Z | error    | The session "2slvnpiyjkj" is not registered. "{\n  sessionId: '2slvnpiyjkj',\n  file: 'abstract.push.js',\n  function: 'sendToOneSession'\n}"
n8n-n8n-1  | 2024-04-04T17:10:40.345Z | debug    | Running node "n8n Form Trigger" started "{\n  node: 'n8n Form Trigger',\n  workflowId: 'ndClDVcBNOtmySlG',\n  file: 'LoggerProxy.js',\n  function: 'exports.debug'\n}"
n8n-n8n-1  | 2024-04-04T17:10:40.346Z | debug    | Running node "n8n Form Trigger" finished successfully "{\n  node: 'n8n Form Trigger',\n  workflowId: 'ndClDVcBNOtmySlG',\n  file: 'LoggerProxy.js',\n  function: 'exports.debug'\n}"
n8n-n8n-1  | 2024-04-04T17:10:40.347Z | debug    | Executing hook on node "n8n Form Trigger" (hookFunctionsPush) "{\n  executionId: '4',\n  sessionId: '2slvnpiyjkj',\n  workflowId: 'ndClDVcBNOtmySlG',\n  file: 'WorkflowExecuteAdditionalData.js',\n  function: 'nodeExecuteAfter'\n}"
n8n-n8n-1  | 2024-04-04T17:10:40.347Z | error    | The session "2slvnpiyjkj" is not registered. "{\n  sessionId: '2slvnpiyjkj',\n  file: 'abstract.push.js',\n  function: 'sendToOneSession'\n}"
n8n-n8n-1  | 2024-04-04T17:10:40.349Z | verbose  | Workflow execution finished successfully "{\n  workflowId: 'ndClDVcBNOtmySlG',\n  file: 'LoggerProxy.js',\n  function: 'exports.verbose'\n}"
n8n-n8n-1  | 2024-04-04T17:10:40.352Z | debug    | Executing hook (hookFunctionsSave) "{\n  executionId: '4',\n  workflowId: 'ndClDVcBNOtmySlG',\n  file: 'WorkflowExecuteAdditionalData.js',\n  function: 'workflowExecuteAfter'\n}"
n8n-n8n-1  | 2024-04-04T17:10:40.354Z | debug    | Save execution data to database for execution ID 4 "{\n  executionId: '4',\n  workflowId: 'ndClDVcBNOtmySlG',\n  finished: true,\n  stoppedAt: 2024-04-04T17:10:40.349Z,\n  file: 'sharedHookFunctions.js',\n  function: 'updateExistingExecution'\n}"
n8n-n8n-1  | 2024-04-04T17:10:40.378Z | debug    | Executing hook (hookFunctionsPush) "{\n  executionId: '4',\n  sessionId: '2slvnpiyjkj',\n  workflowId: 'ndClDVcBNOtmySlG',\n  file: 'WorkflowExecuteAdditionalData.js',\n  function: 'workflowExecuteAfter'\n}"
n8n-n8n-1  | 2024-04-04T17:10:40.386Z | debug    | Save execution progress to database for execution ID 4  "{\n  executionId: '4',\n  workflowId: 'ndClDVcBNOtmySlG',\n  file: 'WorkflowExecuteAdditionalData.js',\n  function: 'workflowExecuteAfter'\n}"
n8n-n8n-1  | 2024-04-04T17:10:40.387Z | error    | The session "2slvnpiyjkj" is not registered. "{\n  sessionId: '2slvnpiyjkj',\n  file: 'abstract.push.js',\n  function: 'sendToOneSession'\n}"
n8n-n8n-1  | 2024-04-04T17:11:30.534Z | debug    | Wait tracker querying database for waiting executions "{ file: 'WaitTracker.js', function: 'getWaitingExecutions' }"
n8n-n8n-1  | 2024-04-04T17:12:30.535Z | debug    | Wait tracker querying database for waiting executions "{ file: 'WaitTracker.js', function: 'getWaitingExecutions' }"
n8n-n8n-1  | 2024-04-04T17:13:30.535Z | debug    | Wait tracker querying database for waiting executions "{ file: 'WaitTracker.js', function: 'getWaitingExecutions' }"
n8n-n8n-1  | 2024-04-04T17:14:30.535Z | debug    | Wait tracker querying database for waiting executions "{ file: 'WaitTracker.js', function: 'getWaitingExecutions' }"

Please share your workflow

Share the output returned by the last node

The node never runs, continuously listening.

Information on your n8n setup

n8n version: 1.34.2
Database (default: SQLite):
n8n EXECUTIONS_PROCESS setting (default: own, main):
Running n8n via (Docker, npm, n8n cloud, desktop app): docker-compose
Operating system: Linux Ubuntu
docker-compose.yml:

version: "3.8"

services:
  # n8n
  n8n:
    image: "docker.n8n.io/n8nio/n8n:latest"
    # restart: always
    user: root
    environment:
      WEBHOOK_URL: https://n8n.domain.com/
      NODE_ENV: production
      N8N_DIAGNOSTICS_ENABLED: false
      N8N_LOG_LEVEL: debug
    volumes: 
      - './n8n/data:/root/.n8n'
    ports: ["909:5678"]

Apache2 Configuration:

<VirtualHost *:80>
        ServerName $serverName
        ServerAlias www.$serverName
        ServerAdmin admin@$serverName

        ErrorLog ${APACHE_LOG_DIR}/$serverName/error.log
        CustomLog ${APACHE_LOG_DIR}/$serverName/access.log combined

        RewriteEngine On
        RewriteCond %{HTTPS} off
        RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
    </VirtualHost>

    <IfModule mod_ssl.c>
    <VirtualHost _default_:443>
        ServerName $serverName
        ServerAlias www.$serverName
        ServerAdmin admin@$serverName

        ErrorLog ${APACHE_LOG_DIR}/$serverName/error.log
        CustomLog ${APACHE_LOG_DIR}/$serverName/access.log combined

        ProxyRequests Off
        ProxyPreserveHost On

        SSLEngine On
        SSLProxyEngine On
        SSLProxyVerify none
        SSLProxyCheckPeerCN off
        SSLProxyCheckPeerName off
        SSLProxyCheckPeerExpire off

        ProxyPass "/" "http://$ip:$port/"
        ProxyPassReverse "/" "http://$ip:$port/"

        SSLCertificateFile /etc/letsencrypt/live/$serverName/fullchain.pem
        SSLCertificateKeyFile /etc/letsencrypt/live/$serverName/privkey.pem
        Include /etc/letsencrypt/options-ssl-apache.conf
        SSLProtocol +TLSv1 +TLSv1.1 +TLSv1.2 +TLSv1.3
        SSLCipherSuite ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:EC>
        SSLHonorCipherOrder on
        SSLCompression off
        SSLOptions +StrictRequire

        LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-agent}i\"" vhost_combined
        LogFormat "%v %h %l %u %t \"%r\" %>s %b" vhost_common
    </VirtualHost>
    </IfModule>

jan · April 4, 2024, 7:22pm

Welcome to the community @RazvanTinca !

It sounds like you do not have setup n8n correctly. Looking at your post does it also not look like you used one of our supported ways of running n8n. You can find easy guides on how to set up n8n correctly and fast here:

Please follow one of them. Like that you can be sure that everything works perfectly and we will also be able to help you if you run into problems. Thanks!

RazvanTinca · April 7, 2024, 6:27pm

Hello Jan.

Thank you for your answer. Unfortunately, even though the solution you proposed is working, I’m required to use apache, as n8n is not the only service on the server, using traefik is not a solution for me, because the ports 443 and 80 are already used.

Also, before upgrading to version 1, it worked this way with apache, and I used it for a very long time.

RazvanTinca · April 21, 2024, 5:48pm

Any other ideas, regarding my problem ?

kube_nerd · July 8, 2024, 7:48am

Hello!

Many have already commented on the forum, it is about the SSE.

For those who don’t know it yet, or don’t know what it’s about. SSE or Websockets are communication protocols. Here is a reference explaining and comparing both.

Reference: SSE vs WebSockets: Comparing Real-Time Communication Protocols

As I deployed n8n in a k8s environment, I used nginx… so I changed this in the n8n envs. Includes permission in nginx for websocket. And I added a note with my frontend URL.

name: N8N_PUSH_BACKEND
value: “websocket”
name: WEBHOOK_URL
value: “https://mydomain.com”
name: VUE_APP_URL_BASE_API
value: “https://mydomain.com”

choiip · September 2, 2024, 8:52am

Hello, I have the same issue.

I found that my n8n self-hosted instance is behind my nginx reverse proxy but I forget to config WebSocket upgrade. Here is the nginx official document on how to config: WebSocket proxying (nginx.org)

After adding the lines of code. The issue is solved.

Hope this can help.

donatello · November 30, 2024, 7:06pm

Saved so much my time bro! Im using nging proxy manager and this helped a lot (finded on reedit):

Currently set for the proxies that need websockets:

Websocket Support

Block Common Exploits

Force SSL

HTTP/2 Support

system · February 28, 2025, 7:07pm

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