# Cannot connect to the Elasticsearch 6.4 after upgrade 6.3 to 6.4

**URL:** <https://discuss.elastic.co/t/cannot-connect-to-the-elasticsearch-6-4-after-upgrade-6-3-to-6-4/149560>\
**Category:** Elasticsearch\
**Created:** [September 22, 2018, 5:09pm UTC](https://discuss.elastic.co/t/cannot-connect-to-the-elasticsearch-6-4-after-upgrade-6-3-to-6-4/149560 "2018-09-22T17:09:19Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![fkelbert](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/fkelbert/32/35762_2.png) [@fkelbert](https://discuss.elastic.co/u/fkelbert)\
**Post date:** [September 24, 2018, 12:15pm UTC](https://discuss.elastic.co/t/cannot-connect-to-the-elasticsearch-6-4-after-upgrade-6-3-to-6-4/149560/2 "2018-09-24T12:15:08Z")

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Hi Maher,

Have you looked into the issue/solution decribed [here](https://discuss.elastic.co/t/elasticsearch-dead-but-subsys-locked/19355)?

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_[View the full topic](https://discuss.elastic.co/t/cannot-connect-to-the-elasticsearch-6-4-after-upgrade-6-3-to-6-4/149560)._