# Issues with upgrade from 8.18.1 to 9.0.1

**URL:** <https://discuss.elastic.co/t/issues-with-upgrade-from-8-18-1-to-9-0-1/378753>\
**Category:** Elasticsearch\
**Created:** [May 30, 2025, 7:34pm UTC](https://discuss.elastic.co/t/issues-with-upgrade-from-8-18-1-to-9-0-1/378753 "2025-05-30T19:34:36Z")\
**Posts on this page:** 1\
**Showing post:** 7

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**Author:** ![Keith\_Massey](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/keith_massey/32/83666_2.png) [@Keith\_Massey](https://discuss.elastic.co/u/Keith_Massey)\
**Post date:** [May 30, 2025, 9:59pm UTC](https://discuss.elastic.co/t/issues-with-upgrade-from-8-18-1-to-9-0-1/378753/7 "2025-05-30T21:59:50Z")

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> I don't know why I'm receiving below error (from dev-tools with elastic account):

I think that you are probably hitting elasticsearch (usually port 9200) from dev tools, and that is a kibana (usually port 5601) API. Elasticsearch doesn't know anything about it.

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