Nabu casa can't connect anymore

When I try to connect using Nabu casa it wont work.
I log in and press connect. I get the loading data:


Then it just gives up and I get this:

But using my internal IP works fine.
Anyone know how to resolve this?

Did you go to the account page and do as instructed?

Account page?
You mean this

And here I click connect as usual.
And I get as above posted.

A few restarts later and it works fine again.