EST test server testrfc7030 returns bad request

Hi,

There was a time I could access the website with a number of instructions to follow for each use-case
- http basic auth
- PoP enforcement with challenge password (tls-unique value)
- etc.

Now, when i try to access EST test server -> https://testrfc7030.com/
I get the following

```
Error 400: Bad Request
An unknown error has occured.
```

Is the service down ?