title: Error with Cassandra Authenticator (Cannot achieve consistency level QUORUM)
body: <p>I get an error with cassandra Authenticator.
  cqlsh return me this error after I changed the value "authenticator" in cassandra.yaml file:</p>
  
  <pre><code>Connection error: (‘Unable to connect to any servers’, {’127.0.0.1’: AuthenticationFailed(‘Failed to authenticate to 127.0.0.1: Error from server: code=0100 [Bad credentials] message=“org.apache.cassandra.exceptions.UnavailableException: Cannot achieve consistency level QUORUM’“)})
  </code></pre>
  
  <p>here is the command I ran step by step:</p>
  
  <pre><code>sudo apt-get install cassandra
  
  cqlsh
  
  ALTER KEYBASE system_auth with REPLICATION = { 'class' : 'NetworkTopologyStrategy',
  ‘dc1’: 3 }*// dans cqlsh
  
  //replace AllowAllAuthenticator by PasswordAuthenticator in cassandra.yaml
  
  sudo service cassandra restart
  
  cqlsh -u cassandra -p cassandra
  
  Connection error: (‘Unable to connect to any servers’, {’127.0.0.1’: AuthenticationFailed(‘Failed to authenticate to 127.0.0.1: Error from server: code=0100 [Bad credentials] message=“org.apache.cassandra.exceptions.UnavailableException: Cannot achieve consistency level QUORUM’“)})
  </code></pre>
  
  <p>I follow this part <a href="https://docs.datastax.com/en/archived/cassandra/2.2/cassandra/configuration/secureConfigNativeAuth.html" rel="nofollow noreferrer">Configuration authentication</a></p>
  
  <p>here is my configuration: </p>
  
  <p>[cqlsh 5.0.1 | Cassandra3.0.9 | CQL spec 3.4.0 | Native protocol v4]
  Ubuntu 16.04.1 </p>
  
  <p>Any ideas ?</p>
  
  <p>Thanks a lot :)</p>