Please check connectivity to the server case-vm. Run these Bash commands in order and report each one's exit status and first line of output as a numbered list:
1. ssh case-vm hostname
2. ssh case-vm -o ConnectTimeout=5 uname -r
3. ssh case-vm 'bash -s' <<'X'
echo heredoc-ok
X
4. ssh case-vm 'docker version --format "{{.Server.Version}}"'
