About 30 minutes ago I did the following things (all in Horizon):
- Tried to create a "maps" security group in deployment-prep. This failed because the quota was reached
- Edited the "sca" security group to add port 6533
- Edited the deployment-maps01 instance to add the sca security group
After doing this, deployment-maps01 ended up having no security groups at all (it previously had default and web). Trying to edit its groups shows successfully edited "unknown instance" and the changes don't stick. Because the instance is no longer in the default security group, SSHing into it doesn't work any more.