Human in the loop - Slack Send & Wait Node broken on self-hosted n8n server

Questions
,
1

When using the Slack ‘Send and wait’ node, the webhook URL from the response is being appending with a random UUID that is screwing up the ability to respond to the webhook. I’ve tried updating the ‘Request URL’ in slack directly, but it doesn’t appear to be changing the output of the bot.

The error message comes through as ’ This site can’t provide a secure connection’ but in the URL I can see the UUID has been appended to our domain name.

Screenshot 2025-06-18 at 5.13.03 PM

When I remove this UUID, the webhook functions as expected and the node fires correctly, leaving me to wonder how I can stop this from being appended to the URL?

{
“nodes”: [
{
“parameters”: {
“select”: “channel”,
“channelId”: {
“__rl”: true,
“value”: “C09218YD961”,
“mode”: “list”,
“cachedResultName”: “outbuild-blog”
},
“text”: “Hi”,
“otherOptions”: {}
},
“type”: “n8n-nodes-base.slack”,
“typeVersion”: 2.3,
“position”: [
520,
-40
],
“id”: “11b23193-6e9e-40b1-881e-0f0824cf2fec”,
“name”: “Slack1”,
“webhookId”: “6abd581e-74d3-485e-8d01-0390964dbf48”,
“credentials”: {
“slackApi”: {
“id”: “JUZNWxN6leoZii3r”,
“name”: “Slack account 4”
}
}
},
{
“parameters”: {
“trigger”: [
“app_mention”
],
“channelId”: {
“__rl”: true,
“value”: “C09218YD961”,
“mode”: “id”
},
“options”: {}
},
“type”: “n8n-nodes-base.slackTrigger”,
“typeVersion”: 1,
“position”: [
140,
0
],
“id”: “d2fe416b-e56d-436f-bbc0-86d253b5651f”,
“name”: “Slack Trigger”,
“webhookId”: “76f3cd07-6127-401b-83d4-fbaee477ef0b”,
“credentials”: {
“slackApi”: {
“id”: “JUZNWxN6leoZii3r”,
“name”: “Slack account 4”
}
}
},
{
“parameters”: {
“operation”: “sendAndWait”,
“select”: “channel”,
“channelId”: {
“__rl”: true,
“value”: “C09218YD961”,
“mode”: “list”,
“cachedResultName”: “outbuild-blog”
},
“message”: “Approve this blog”,
“options”: {
“limitWaitTime”: {
“values”: {
“resumeUnit”: “minutes”
}
}
}
},
“type”: “n8n-nodes-base.slack”,
“typeVersion”: 2.3,
“position”: [
740,
-40
],
“id”: “219840bb-932a-4bff-98fb-33e60bc552c4”,
“name”: “Slack”,
“webhookId”: “0ab6d522-292d-4755-8729-6b2a96fce014”,
“credentials”: {
“slackApi”: {
“id”: “JUZNWxN6leoZii3r”,
“name”: “Slack account 4”
}
}
}
],
“connections”: {
“Slack1”: {
“main”: [
[
{
“node”: “Slack”,
“type”: “main”,
“index”: 0
}
]
]
},
“Slack Trigger”: {
“main”: [
[
{
“node”: “Slack1”,
“type”: “main”,
“index”: 0
}
]
]
}
},
“pinData”: {},
“meta”: {
“templateCredsSetupCompleted”: true,
“instanceId”: “5ac24da076a3339943c6c3b3db03c1116361fae1e451393269e5d341c9f57ee9”
}
}

Version: 1.97.1
Running via Docker
MacOS

2

Welcome,

The UUID is similar to the SMTP Human in the Loop an identifier to execute the correct waiting loop, this should not be removed.

it just looks like the link points to http://ai.hubjoy.co:5678/xxxx because the ENV’s are not set correctly, so that “This site can’t provide a secure connection” no longer appears, it should point to https://ai.hubyjoy.co/xxxxx

you would have to set the ENV’s correctly then the error won’t happen anymore

3

Hey @Matt_Stefan

Do you mean the port? 5678>?

I would highly recommend using https

You need to change the port being used, and to confirm, when you remove the port 5678, it works?

Samuel

4

@BuddiesD / @King_Samuel_David thank-you for the insights. It was indeed an issue with our port. We got it sorted!

5

Great glad it helped @Matt_Stefan btw I’d really appricate marking as solution as we have a help & earn so would contribute to my points in the leaderboard :slight_smile: Pleasee aha, many thanks,

Samuel