# Data nodes unable to join masternode **URL:** https://discuss.elastic.co/t/data-nodes-unable-to-join-masternode/151106 **Category:** Elasticsearch **Tags:** elastic-stack-security **Created:** [October 4, 2018, 7:06pm UTC](https://discuss.elastic.co/t/data-nodes-unable-to-join-masternode/151106 "2018-10-04T19:06:34Z") **Posts on this page:** 1 **Showing post:** 2
### Author: ![TimV](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/timv/32/13162_2.png) [@TimV](https://discuss.elastic.co/u/TimV) #### Post date: [October 5, 2018, 12:27am UTC](https://discuss.elastic.co/t/data-nodes-unable-to-join-masternode/151106/2 "2018-10-05T00:27:02Z")
The log message you posted is unlikely to be causing problems with cluster formation. 1. It's a `DEBUG` message, not an actual error. Sometime the debug messages help understand the cause of problems, but cluster formation problems will report an actual `ERROR` or `WARN` message. 2. It's specically about `REST request [/]` and the nodes don't communicated with one another using the REST interface. 3. As @spinscale answered in your [other post](https://discuss.elastic.co/t/missing-authentication-token-for-rest-request/151103/2), this message means that you made a request to a node that requires authentication, but you didn't supply any credentials. --- _[View the full topic](https://discuss.elastic.co/t/data-nodes-unable-to-join-masternode/151106)._