Just to get rid of the obvious, is that the basic auth string you send to the router, or have you used another just here on the forum (which would be wise)? Notices it’s the same as on the http binding docs example.
Are you sure the router accepts basic auth? Maybe you need to add a / after the ip address? Have you tried logging in with basic auth from a browser?
It looks like this is the culprit.
I was not able to login to the router with credentials provided via browser url.
So I guess I’m out of luck here. Thx again.