title: Gravitational Teleport error on adding remote nodes
body: <p>Just installed for the first time Teleport (ver. 8.0.1) on an Ubuntu 20.04 VM. I'm able to login into the web UI.
  Now I'm trying to add a remote node to the main server (bastion).
  Following the docs, when trying to add node, this error shows up:</p>
  <pre><code>INFO [PROC:1] Connecting to the cluster NODE1 with TLS client certificate. service/connect.go:132
  ERRO [PROC:1] Node failed to establish connection to cluster: Failed to connect to Auth Server directly or over tunnel, no methods remaining.. service/connect.go:68
  </code></pre>
  <p>BTW, there's no firewall enabled (neither system nor cloud firewall).</p>
  <p>To add a node, I did the following:</p>
  <ol>
  <li>SSH into bastion server and ran: <code>tctl tokens add --type=node</code></li>
  <li>SSH into node server and ran:
  <code>sudo teleport start --roles=node --token=XXX --ca-pin=XXX --auth-server=SERVER_FQDN_NAME:3025</code></li>
  </ol>
  <p>Is this the proper way to add a node? (the official docs are quite confusing... some say that this last command should be performed in the bastion host, some other say in the node host... and also pointing to different ports 3025 in this case or 443 in others)</p>