When database is off for any reason, the torque renderer throws an error that only says "Error: connect ECONNREFUSED". It would be nice if it could tell more about the problem, like including the "TorqueRenderer label or something.
It took some time to figure. See CartoDB/Windshaft-cartodb#171
I'm wondering if the response should also be a 500 http status rather than a 400, your opinion @javisantana ?
I'll turn into a 500, the testcase is almost ready
Use "TorqueRenderer" prefix for errors generated by it