Thanks Larry.
Apparently, administrator privileges gave me some improvement. It goes to connection with following logs. And I was able to Kibana login window. However, from there, I am still not able to log in because of the following statement.
ps. I am still using credentials that I have auto generated at the first place when I installed elastic search. It is reflected in kibana.yml (user and password)
Both X-pack installed. (I think)
(Login is currently disabled. Administrators should consult the Kibana logs for more details.)
log [04:21:48.705] [error][status][plugin:index_management@6.3.0] Status changed from red to red - [security_exception] missing authentication token for REST request [/_xpack], with { header={ WWW-Authenticate="Basic realm=\"security\" charset=\"UTF-8\"" } }
log [04:21:48.706] [error][status][plugin:graph@6.3.0] Status changed from red to red - [security_exception] missing authentication token for REST request [/_xpack], with { header={ WWW-Authenticate="Basic realm=\"security\" charset=\"UTF-8\"" } }
log [04:21:48.707] [error][status][plugin:security@6.3.0] Status changed from red to red - [security_exception] missing authentication token for REST request [/_xpack], with { header={ WWW-Authenticate="Basic realm=\"security\" charset=\"UTF-8\"" } }
log [04:21:48.708] [error][status][plugin:grokdebugger@6.3.0] Status changed from red to red - [security_exception] missing authentication token for REST request [/_xpack], with { header={ WWW-Authenticate="Basic realm=\"security\" charset=\"UTF-8\"" } }
log [04:21:48.709] [error][status][plugin:logstash@6.3.0] Status changed from red to red - [security_exception] missing authentication token for REST request [/_xpack], with { header={ WWW-Authenticate="Basic realm=\"security\" charset=\"UTF-8\"" } }
log [04:21:48.710] [error][status][plugin:reporting@6.3.0] Status changed from red to red - [security_exception] missing authentication token for REST request [/_xpack], with { header={ WWW-Authenticate="Basic realm=\"security\" charset=\"UTF-8\"" } }
log [04:21:53.724] [info][listening] Server running at http://localhost:5601
log [04:22:18.705] [warning][license][xpack] License information from the X-Pack plugin could not be obtained from Elasticsearch for the [data] cluster. [security_exception] missing authentication token for REST request [/_xpack], with { header={ WWW-Authenticate="Basic realm=\"security\" charset=\"UTF-8\"" } } :: {"path":"/_xpack","statusCode":401,"response":"{\"error\":{\"root_cause\":[{\"type\":\"security_exception\",\"reason\":\"missing authentication token for REST request [/_xpack]\",\"header\":{\"WWW-Authenticate\":\"Basic realm=\\\"security\\\" charset=\\\"UTF-8\\\"\"}}],\"type\":\"security_exception\",\"reason\":\"missing authentication token for REST request [/_xpack]\",\"header\":{\"WWW-Authenticate\":\"Basic realm=\\\"security\\\" charset=\\\"UTF-8\\\"\"}},\"status\":401}","wwwAuthenticateDirective":"Basic realm=\"security\" charset=\"UTF-8\""}
log [04:22:48.720] [warning][license][xpack] License information from the X-Pack plugin could not be obtained from Elasticsearch for the [data] cluster. [security_exception] missing authentication token for REST request [/_xpack], with { header={ WWW-Authenticate="Basic realm=\"security\" charset=\"UTF-8\"" } } :: {"path":"/_xpack","statusCode":401,"response":"{\"error\":{\"root_cause\":[{\"type\":\"security_exception\",\"reason\":\"missing authentication token for REST request [/_xpack]\",\"header\":{\"WWW-Authenticate\":\"Basic realm=\\\"security\\\" charset=\\\"UTF-8\\\"\"}}],\"type\":\"security_exception\",\"reason\":\"missing authentication token for REST request [/_xpack]\",\"header\":{\"WWW-Authenticate\":\"Basic realm=\\\"security\\\" charset=\\\"UTF-8\\\"\"}},\"status\":401}","wwwAuthenticateDirective":"Basic realm=\"security\" charset=\"UTF-8\""}
log [04:23:18.732] [warning][license][xpack] License information from the X-Pack plugin could not be obtained from Elasticsearch for the [data] cluster. [security_exception] missing authentication token for REST request [/_xpack], with { header={ WWW-Authenticate="Basic realm=\"security\" charset=\"UTF-8\"" } } :: {"path":"/_xpack","statusCode":401,"response":"{\"error\":{\"root_cause\":[{\"type\":\"security_exception\",\"reason\":\"missing authentication token for REST request [/_xpack]\",\"header\":{\"WWW-Authenticate\":\"Basic realm=\\\"security\\\" charset=\\\"UTF-8\\\"\"}}],\"type\":\"security_exception\",\"reason\":\"missing authentication token for REST request [/_xpack]\",\"header\":{\"WWW-Authenticate\":\"Basic realm=\\\"security\\\" charset=\\\"UTF-8\\\"\"}},\"status\":401}","wwwAuthenticateDirective":"Basic realm=\"security\" charset=\"UTF-8\""}
log [04:23:48.750] [warning][license][xpack] License information from the X-Pack plugin could not be obtained from Elasticsearch for the [data] cluster. [security_exception] missing authentication token for REST request [/_xpack], with { header={ WWW-Authenticate="Basic realm=\"security\" charset=\"UTF-8\"" } } :: {"path":"/_xpack","statusCode":401,"response":"{\"error\":{\"root_cause\":[{\"type\":\"security_exception\",\"reason\":\"missing authentication token for REST request [/_xpack]\",\"header\":{\"WWW-Authenticate\":\"Basic realm=\\\"security\\\" charset=\\\"UTF-8\\\"\"}}],\"type\":\"security_exception\",\"reason\":\"missing authentication token for REST request [/_xpack]\",\"header\":{\"WWW-Authenticate\":\"Basic realm=\\\"security\\\" charset=\\\"UTF-8\\\"\"}},\"status\":401}","wwwAuthenticateDirective":"Basic realm=\"security\" charset=\"UTF-8\""}