I am testing out the new feature "Integrated User Interface".
Unfortunately, it isn't working

In my /var/log/lfd.log I get this error:
Oct 26 12:23:24 pluto lfd[17877]: UI: *Error* cannot open server on port 6666: IO::Socket::INET6 configuration failederror:00000000:lib(0):func(0):reason(0), at line 6079
Does anyone know what is going wrong?
Thanks in advance.
- Thijmen
Edit: My bad, should be posted in Bug reports.