Thanks Henrik. It appears this may be a bug of some sort. I'll need to investigate but glad it's not preventing your sequence from running.

When I do the post from Winodows CMD i get this:

PS I figured out that at can activat/test my Webhook to IFTTT from CMD with this: 

curl -X POST https://maker.ifttt.com/trigger/RL2ON/with/key/myhexkey

This error is now fixed.

Nice work with the CMD find! Yes, you should be able to trigger the IFTTT webhook triggers from anywhere that you can call a URL.

The resons still looks strange: 

CMD call of :C:\Users\Henrik>curl -X POST http://sequematic.com/trigger-ifttt-webhook/my_key/id/Sunrise/15/0/badweather/p4"

Gives this response: 

        {

            "data": [

                {

                    "id": "1234"

                }

            ]

        }

wich looks strange to me.

The Sequnece is activated and the parameters are passed as expected OK

Keep up the good work  

That's actually a successful response. A message like "success" would probably be more meaningful so I'll look at changing that, but what you're seeing is valid so nothing to worry about.