Please use TQ, the real server, while Singularity is not available 
- and Singularity will return pretty soon- very likely even with a new mirror.
We have several internal test servers, but they are unfortunately not as well setup as Singularity - they are simply too slow. Btw, regarding Duality: We will very likely remove Duality as public test server for the time being (as it was not open to the public since last September) and re-use its hardware for one of our internal test servers, so that we do not have to do all internal tests on Singularity.