1. have a (ec2) cloud with at least 1 instance with alias 2. launch another instance (using same image) enter alias that you've already used Currently: An error "Could not refresh instance xxx" is reported, it seems like instance was not started, but it was. After refreshing cloud it is obvious. Expected: We can deny using same alias for multiple instances and/or fix the error Truth is: I've reproduced this only once or twice, unable to repro it again.