# Elasticsearch 8.5.1 with NEST 7.17.5

**URL:** https://discuss.elastic.co/t/elasticsearch-8-5-1-with-nest-7-17-5/363921
**Category:** Elastic Search
**Created:** [July 28, 2024, 10:09am UTC](https://discuss.elastic.co/t/elasticsearch-8-5-1-with-nest-7-17-5/363921 "2024-07-28T10:09:08Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![esterM](https://avatars.discourse-cdn.com/v4/letter/e/e47774/32.png) [@esterM](https://discuss.elastic.co/u/esterM)
#### Post date: [July 28, 2024, 10:09am UTC](https://discuss.elastic.co/t/elasticsearch-8-5-1-with-nest-7-17-5/363921/1 "2024-07-28T10:09:08Z")

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Hi,  
I am using elasticsearch 8.5.1.  
with Client NEST 7.17.5 (C#)  
I get an error every time I refer to Elastic (check if index exist/create index...) :  
"The client is unable to verify that the server is elasticsearch due to an unsuccessful product check call. some functionality may not be compatible if the server is running an unsupported product."  
When I try to access the same calls with the same URL, username and password via CURL I get success  
Is it related to version incompatibility? How can this be resolved?

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### Author: ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)
#### Post date: [July 28, 2024, 11:40am UTC](https://discuss.elastic.co/t/elasticsearch-8-5-1-with-nest-7-17-5/363921/2 "2024-07-28T11:40:19Z")

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I guess you need to update the client.

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### Author: ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)
#### Post date: [August 25, 2024, 11:41am UTC](https://discuss.elastic.co/t/elasticsearch-8-5-1-with-nest-7-17-5/363921/3 "2024-08-25T11:41:02Z")

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