Redirect URI {"error":"invalid_request", "error_description":"Invalid redirection URI."}

markusvanlaak — Thu, 30 Apr 2026 07:01:56 GMT

Hi,

I'm starting to explore the Vissmann API.

When following the docs: https://api.viessmann-climatesolutions.com/documentation/static/authentication
In step one there is no other redirect URL accepted that http://localhost:4200 as described in the example.

When I change the port to 4201 i get {"error":"invalid_request", "error_description":"Invalid redirection URI."}

Why does the API behave like that?

Thema "Redirect URI {"error":"invalid_request", "error_description":"Invalid redirection URI."}" in Getting started programming with the Viessmann API