# Unable to start Logstash: Encountered a retryable error. Will Retry with exponential backoff

**URL:** <https://discuss.elastic.co/t/unable-to-start-logstash-encountered-a-retryable-error-will-retry-with-exponential-backoff/130347>\
**Category:** Logstash\
**Created:** [May 3, 2018, 1:56am UTC](https://discuss.elastic.co/t/unable-to-start-logstash-encountered-a-retryable-error-will-retry-with-exponential-backoff/130347 "2018-05-03T01:56:45Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![betty](https://avatars.discourse-cdn.com/v4/letter/b/0ea827/32.png) [@betty](https://discuss.elastic.co/u/betty)\
**Post date:** [May 3, 2018, 1:56am UTC](https://discuss.elastic.co/t/unable-to-start-logstash-encountered-a-retryable-error-will-retry-with-exponential-backoff/130347/1 "2018-05-03T01:56:46Z")

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Hi,

Logstash version: 6.1.2  
ES version: 6.1.2

I am using Logstash to transferring data to Elasticsearch.

After starting logstash it just keeps giving logs like below:  
[2018-05-02T18:48:56,892][ERROR][logstash.outputs.elasticsearch] Encountered a retryable error. Will Retry with exponential backoff {:code=\>400, :url=\>"[http://hostname:9200/\_bulk](http://hostname:9200/_bulk)"}  
[2018-05-02T18:50:00,898][ERROR][logstash.outputs.elasticsearch] Encountered a retryable error. Will Retry with exponential backoff {:code=\>400, :url=\>"[http://hostname:9200/\_bulk](http://hostname:9200/_bulk)"}

In addition, Elasticsearch is starting and has no error message about this.  
I think it's a pure Logstash failure but still do not know how to solve it after searching for many similar problems.

Can you please give some advice on this? Thanks very much!

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [May 31, 2018, 1:56am UTC](https://discuss.elastic.co/t/unable-to-start-logstash-encountered-a-retryable-error-will-retry-with-exponential-backoff/130347/2 "2018-05-31T01:56:53Z")

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