# Attempted to resurrect connection to dead ES instance, but got an error **URL:** \ **Category:** Logstash\ **Created:** [October 4, 2017, 12:00am UTC](https://discuss.elastic.co/t/attempted-to-resurrect-connection-to-dead-es-instance-but-got-an-error/102632 "2017-10-04T00:00:14Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Adam\_Schappell](https://avatars.discourse-cdn.com/v4/letter/a/46a35a/32.png) [@Adam\_Schappell](https://discuss.elastic.co/u/Adam_Schappell)\ **Post date:** [October 4, 2017, 12:00am UTC](https://discuss.elastic.co/t/attempted-to-resurrect-connection-to-dead-es-instance-but-got-an-error/102632/1 "2017-10-04T00:00:14Z")
Hey all can someone help me please. I just upgraded to XPack and am having trouble getting Logstash back up and running. Here is the errors I am seeing in logstash-plain.log [2017-10-03T19:58:14,092][WARN][logstash.outputs.elasticsearch] Error while performing sniffing {:error\_message=\>"Got response code '401' contacting Elasticsearch at URL '[http://127.0.0.1:9200/\_nodes/http](http://127.0.0.1:9200/_nodes/http)'", :class=\>"LogStash::Outputs::ElasticSearch::HttpClient::Pool::BadResponseCodeError", :backtrace=\>["/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-7.4.2-java/lib/logstash/outputs/elasticsearch/http\_client/manticore\_adapter.rb:80:in `perform_request'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-7.4.2-java/lib/logstash/outputs/elasticsearch/http_client/pool.rb:279:in`perform\_request\_to\_url'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-7.4.2-java/lib/logstash/outputs/elasticsearch/http\_client/pool.rb:266:in `perform_request'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-7.4.2-java/lib/logstash/outputs/elasticsearch/http_client/pool.rb:361:in`with\_connection'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-7.4.2-java/lib/logstash/outputs/elasticsearch/http\_client/pool.rb:265:in `perform_request'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-7.4.2-java/lib/logstash/outputs/elasticsearch/http_client/pool.rb:163:in`check\_sniff'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-7.4.2-java/lib/logstash/outputs/elasticsearch/http\_client/pool.rb:156:in `sniff!'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-7.4.2-java/lib/logstash/outputs/elasticsearch/http_client/pool.rb:145:in`start\_sniffer'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-7.4.2-java/lib/logstash/outputs/elasticsearch/http\_client/pool.rb:127:in `until_stopped'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-7.4.2-java/lib/logstash/outputs/elasticsearch/http_client/pool.rb:143:in`start\_sniffer'"]} [2017-10-03T19:58:14,142][INFO][logstash.outputs.elasticsearch] Running health check to see if an Elasticsearch connection is working {:healthcheck\_url=\>[http://localhost:9200/](http://localhost:9200/), :path=\>"/"} [2017-10-03T19:58:14,148][WARN][logstash.outputs.elasticsearch] Attempted to resurrect connection to dead ES instance, but got an error. {:url=\>"[http://localhost:9200/](http://localhost:9200/)", :error\_type=\>LogStash::Outputs::ElasticSearch::HttpClient::Pool::BadResponseCodeError, :error=\>"Got response code '401' contacting Elasticsearch at URL '[http://localhost:9200/](http://localhost:9200/)'"} [2017-10-03T19:58:14,172][INFO][logstash.outputs.elasticsearch] Running health check to see if an Elasticsearch connection is working {:healthcheck\_url=\>[http://localhost:9200/](http://localhost:9200/), :path=\>"/"} [2017-10-03T19:58:14,176][WARN][logstash.outputs.elasticsearch] Attempted to resurrect connection to dead ES instance, but got an error. {:url=\>"[http://localhost:9200/](http://localhost:9200/)", :error\_type=\>LogStash::Outputs::ElasticSearch::HttpClient::Pool::BadResponseCodeError, :error=\>"Got response code '401' contacting Elasticsearch at URL '[http://localhost:9200/](http://localhost:9200/)'"} [2017-10-03T19:58:19,081][INFO][logstash.outputs.elasticsearch] Running health check to see if an Elasticsearch connection is working {:healthcheck\_url=\>[http://127.0.0.1:9200/](http://127.0.0.1:9200/), :path=\>"/"} [2017-10-03T19:58:19,087][WARN][logstash.outputs.elasticsearch] Attempted to resurrect connection to dead ES instance, but got an error. {:url=\>"[http://127.0.0.1:9200/](http://127.0.0.1:9200/)", :error\_type=\>LogStash::Outputs::ElasticSearch::HttpClient::Pool::BadResponseCodeError, :error=\>"Got response code '401' contacting Elasticsearch at URL '[http://127.0.0.1:9200/](http://127.0.0.1:9200/)'"} [2017-10-03T19:58:19,100][WARN][logstash.outputs.elasticsearch] Error while performing sniffing {:error\_message=\>"Got response code '401' contacting Elasticsearch at URL '[http://127.0.0.1:9200/\_nodes/http](http://127.0.0.1:9200/_nodes/http)'", :class=\>"LogStash::Outputs::ElasticSearch::HttpClient::Pool::BadResponseCodeError", :backtrace=\>["/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-7.4.2-java/lib/logstash/outputs/elasticsearch/http\_client/manticore\_adapter.rb:80:in `perform_request'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-7.4.2-java/lib/logstash/outputs/elasticsearch/http_client/pool.rb:279:in`perform\_request\_to\_url'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-7.4.2-java/lib/logstash/outputs/elasticsearch/http\_client/pool.rb:266:in `perform_request'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-7.4.2-java/lib/logstash/outputs/elasticsearch/http_client/pool.rb:361:in`with\_connection'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-7.4.2-java/lib/logstash/outputs/elasticsearch/http\_client/pool.rb:265:in `perform_request'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-7.4.2-java/lib/logstash/outputs/elasticsearch/http_client/pool.rb:163:in`check\_sniff'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-7.4.2-java/lib/logstash/outputs/elasticsearch/http\_client/pool.rb:156:in `sniff!'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-7.4.2-java/lib/logstash/outputs/elasticsearch/http_client/pool.rb:145:in`start\_sniffer'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-7.4.2-java/lib/logstash/outputs/elasticsearch/http\_client/pool.rb:127:in `until_stopped'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-7.4.2-java/lib/logstash/outputs/elasticsearch/http_client/pool.rb:143:in`start\_sniffer'"]} [2017-10-03T19:58:19,155][INFO][logstash.outputs.elasticsearch] Running health check to see if an Elasticsearch connection is working {:healthcheck\_url=\>[http://localhost:9200/](http://localhost:9200/), :path=\>"/"} [2017-10-03T19:58:19,160][WARN][logstash.outputs.elasticsearch] Attempted to resurrect connection to dead ES instance, but got an error. {:url=\>"[http://localhost:9200/](http://localhost:9200/)", :error\_type=\>LogStash::Outputs::ElasticSearch::HttpClient::Pool::BadResponseCodeError, :error=\>"Got response code '401' contacting Elasticsearch at URL '[http://localhost:9200/](http://localhost:9200/)'"} [2017-10-03T19:58:19,178][INFO][logstash.outputs.elasticsearch] Running health check to see if an Elasticsearch connection is working {:healthcheck\_url=\>[http://localhost:9200/](http://localhost:9200/), :path=\>"/"} [2017-10-03T19:58:19,184][WARN][logstash.outputs.elasticsearch] Attempted to resurrect connection to dead ES instance, but got an error. {:url=\>"[http://localhost:9200/](http://localhost:9200/)", :error\_type=\>LogStash::Outputs::ElasticSearch::HttpClient::Pool::BadResponseCodeError, :error=\>"Got response code '401' contacting Elasticsearch at URL '[http://localhost:9200/](http://localhost:9200/)'"} ---
**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\ **Post date:** [October 6, 2017, 5:39am UTC](https://discuss.elastic.co/t/attempted-to-resurrect-connection-to-dead-es-instance-but-got-an-error/102632/2 "2017-10-06T05:39:11Z")
> [@Adam\_Schappell](#): > > Got response code '401' That indicates you haven't setup auth in the Logstash config. Can you post it for us to see? ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [November 3, 2017, 5:39am UTC](https://discuss.elastic.co/t/attempted-to-resurrect-connection-to-dead-es-instance-but-got-an-error/102632/3 "2017-11-03T05:39:20Z")
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