slack trigger isn't working

[tylerqr]

Slack Trigger node is broken

trying my webhook urls for both production and testing on my slack trigger node in slack, slack says n8n keeps responding with HTTP error. ## What is the error message (if any)?

Literally stuck on the first node when trying out n8n

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.)

{
"nodes": [
{
"parameters": {
"trigger": [
"message"
],
"channelId": {
"__rl": true,
"value": "C01GDR3F4BD",
"mode": "id"
},
"options": {}
},
"type": "n8n-nodes-base.slackTrigger",
"typeVersion": 1,
"position": [
0,
0
],
"id": "f2faedd3-4303-49c8-814f-d708e075afc5",
"name": "Slack Trigger",
"webhookId": "08c8ef0c-7187-4732-a6d0-51352495b289",
"credentials": {
"slackApi": {
"id": "JF5lcy1ymRW8DZnA",
"name": "Slack account"
}
}
}
],
"connections": {},
"pinData": {},
"meta": {
"templateCredsSetupCompleted": true,
"instanceId": "a73fd295cab82fa420e6d9a25c8565695f43a6dca08ebc31ffdd75f3c7435d5a"
}
}

Share the output returned by the last node

Debug info

core

• n8nVersion: 1.75.2
• platform: npm
• nodeJsVersion: 20.18.1
• database: sqlite
• executionMode: regular
• concurrency: 5
• license: community

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 (macintosh; intel mac os x 10_15_7) applewebkit/537.36 (khtml, like gecko) chrome/131.0.0.0 safari/537.36
• isTouchDevice: false

Generated at: 2025-01-22T16:03:29.445Z}

[Joffcom]

Hey @tylerqr,

We have created an internal ticket to look into this which we will be tracking as "N8N-8204"

[Joffcom]

Hey @tylerqr

Is your workflow active?

[tylerqr]

@Joffcom No, I went to test it and it can't see the slack messages.

[Joffcom]

Hey @tylerqr

If the workflow is not active I would expect the /webhook/ url to fail like it is.

Instead use the test url and before you paste it into Slack make sure you click the execute workflow button first so that n8n is listening for the connection.

As this doesn't appear to be a bug and looks to be a support issue I am going to mark this as closed, if the above doesn't work can you create a post on the support forum and we can ask the support team to pick this up there.

[RCheesley]

Hey folks! I've got this problem too. When the workflow is not active, neither the test or the production URL work.

When the workflow is active, the production one works, but the test one doesn't still.

I can't find any way to actually test our workflows and get the right data from the trigger because it doesn't seem to be working at all with the test webhook URL.

If I try to change production URL to test URL (with the n8n workflow unpublished, and copying the test URL) I get the error reported. See below.

I am on n8n Cloud if that helps, version is n8n@1.81.4. @Joffcom happy to help troubleshoot this with you if that helps, trying to set up a Slack onboarding workflow.

[dimmisel]

The same problem too. How we can get the previous step data if we cannot execute this as a test case?
@Joffcom please help us.
@RCheesley if you have any idea, I would like to know about that

[RCheesley]

Please see my comment in the linked issue:

#14102 (comment)