Github user kohlmu-pivotal commented on a diff in the pull request:

    https://github.com/apache/geode/pull/719#discussion_r134050811
  
    --- Diff: 
geode-protobuf/src/main/java/org/apache/geode/protocol/protobuf/ProtobufSimpleAuthenticator.java
 ---
    @@ -40,20 +42,28 @@ public void receiveMessage(InputStream inputStream, 
OutputStream outputStream,
         properties.setProperty("username", 
authenticationRequest.getUsername());
         properties.setProperty("password", 
authenticationRequest.getPassword());
     
    +    authorizer = null; // authenticating a new user clears current 
authorizer
         try {
           Object principal = securityManager.authenticate(properties);
    -      authenticated = principal != null;
    +      if (principal != null) {
    +        authorizer = new ProtobufSimpleAuthorizer(principal, 
securityManager);
    +      }
         } catch (AuthenticationFailedException e) {
    -      authenticated = false;
    +      authorizer = null;
         }
     
    -    
AuthenticationAPI.SimpleAuthenticationResponse.newBuilder().setAuthenticated(authenticated)
    +    
AuthenticationAPI.SimpleAuthenticationResponse.newBuilder().setAuthenticated(isAuthenticated())
             .build().writeDelimitedTo(outputStream);
       }
     
       @Override
       public boolean isAuthenticated() {
    -    return authenticated;
    +    return authorizer != null;
    --- End diff --
    
    I must disagree with this logic. Something is NOT `authenticated` just 
because there is an authorizer populated. A authorizer should be constructed 
BECAUSE something was `authenticated`


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