I am currently having problem connecting to the ssh console of my vm instance. If you need info on the vm instance I think the operating system is a Linux Debian 3.7.4. I think it has something to do with the SSH keys on the instance. The Opencart website hosted on the instance still works. Here is a screenshot of the error message which is (#15):Screenshot of error(#15)
Also, here is some of info from the stackdriver log: