While watching the > default: Warning: Remote connection disconnect. Retrying… repeat, I logged into the vagrant box and ran "journalctl -f". It seems as though vagrant is failing to authenticate with the centos-7.1 bento box. I created a new centos-7.6 bento box and was able to immediately authenticate into it with the vagrant ssh command
It’s important to note that the tutorial I was following is dated back from 2015 and was written/being hosted by mesosphere