How to use velocity with remote Mongodb

if i start meteor just by >$ meteor and therefore a local mongodb velocity runs my tests without problems. but if i try to connect to a remote mongodb testing fails >$ MONGO_URL=<mongostring> meteor

velocity tells me, that a mirror is running and when i go there with >$ meteor all is fine but with >$ MONGO_URL=<mongostring> meteor i just get this error message http://ift.tt/1falQgo

what am i doing wrong? i would be happy to not use the remote db at all for testing but i don't want to restart the server with different configurations to test, i want the tests fly by, the way its supposed to be.