Script for testing access to a single ssh host.Loop with something like: cat ~/my-hosts | xargs -I X bash -c 'echo -n "X: " && ssh-test.sh myusername@X'

ssh-test.sh

#!/bin/bash

main() {
  declare host="$1"
  ssh -oUserKnownHostsFile=/dev/null -oStrictHostKeyChecking=no -oBatchMode=yes -oConnectTimeout=5 -vvv $host -- exit > /tmp/sshtest 2>&1 
  if [[ $? == 0 ]]; then
    echo "OK"
    exit
  fi

  if cat /tmp/sshtest | grep "^ssh:.*Connection refused" > /dev/null; then
    echo "CONNECTION REFUSED"
    exit 1
  fi

  if cat /tmp/sshtest | grep "^Permission denied" > /dev/null; then
    echo "PERMISSION DENIED"
    exit 2
  fi

  if cat /tmp/sshtest | grep "^ssh:.*Connection timed out" > /dev/null; then
    echo "TIMEOUT"
    exit 3
  fi

  echo "UNKNOWN"
  exit 4
}

main $@