SSL connection issue for Couchbase Server 6.6

Java SDK
1

Hi,
I am using Couchbase Server 6.6 and I am going to setup SSL connection.
Guys gave certificate and password but I always has error:
ConfigurationException: Could not open bucket.

My working code without SSL is

public Bucket marketDataBucket() {
        Cluster cluster = couchbaseCluster();
        Bucket bucket = cluster.openBucket("MyBucket");
        return bucket;
    }

public CouchbaseEnvironment couchbaseEnvironment() {
        return DefaultCouchbaseEnvironment.builder().build();
    }

public Cluster couchbaseCluster() {
        return CouchbaseCluster.create(couchbaseEnvironment(), "couchbase://xxx-yyy-zzz")
        .authenticate("test", "test");
    }

Code with SSL

public Bucket marketDataBucket() {
        Cluster cluster = couchbaseCluster();
        Bucket bucket = cluster.openBucket("MyBucket");
        return bucket;
    }

public CouchbaseEnvironment couchbaseEnvironment() {
        return DefaultCouchbaseEnvironment.builder()
            .sslEnabled(true)
            .sslKeystoreFile("C:/Dev/certificate/cert.pfx")
            .sslKeystorePassword("Password")            
            .build();
    }

public Cluster couchbaseCluster() {
        return CouchbaseCluster.create(couchbaseEnvironment(), "couchbase://xxx-yyy-zzz");
    }

I also tried next code

public Bucket marketDataBucket() {
        Cluster cluster = couchbaseCluster();
        Bucket bucket = cluster.openBucket("MyBucket");
        return bucket;
    }

public CouchbaseEnvironment couchbaseEnvironment() {
        return DefaultCouchbaseEnvironment.builder()
            .sslEnabled(true)
            .certAuthEnabled(true)
            .sslKeystoreFile("C:/Dev/certificate/cert.pfx")
            .sslKeystorePassword("Password")            
            .build();
    }

public Cluster couchbaseCluster() {
        return CouchbaseCluster.create(couchbaseEnvironment(), "couchbase://xxx-yyy-zzz").authenticate(CertAuthenticator.INSTANCE);
    }

However, situation is the same.

I also create test_cert.pfx like this
Couchbase > Security > Root certificate
Copied the certificate and added to my keystore .
I used in my code instead of cert.pfx but I have the same issue
ConfigurationException: Could not open bucket.

I could not find some examples Couchbase Server 6.6 to check what I did wrongly.
Maybe somebody know how to fix my issue?