Common SSH problems
If you run into an SSH problem, share your issue here, and we can see if there is a simple solution. In some places local internet settings might prevent you from being able to ssh to a server.
Q : After launching a VM I get an error connecting similar to "network unavailable"
A : If you have just launched a VM, you may find that it is not available strait away. Wait for a few minutes and try again.
Q : When I try to ssh to a new server I get a warning about a host key change
A : The first time you connect to a server via SSH a key is stored for that server. If you then destroy that server, and reconnect to a new server, using the same IP, there will be a missmatch between the server key and the key your computer has stored. To resolve this, you have to remove the old key from a file called known_hosts.
To do this open the file known_hosts using a text editor (here I use vi)
within this file search for the line containing the key you wish to remove; the line with keys will look something like this;
You need to delete the whole line (removing the IP, the text next to it and the key - the long string of characters). Once you have done this you should be able to ssh without a problem.