# Encrypt Communication b/w kibana and elasticsearch

**URL:** <https://discuss.elastic.co/t/encrypt-communication-b-w-kibana-and-elasticsearch/265527>\
**Category:** Elasticsearch\
**Tags:** elastic-stack-security\
**Created:** [February 25, 2021, 5:28pm UTC](https://discuss.elastic.co/t/encrypt-communication-b-w-kibana-and-elasticsearch/265527 "2021-02-25T17:28:45Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![ikakavas](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ikakavas/32/34430_2.png) [@ikakavas](https://discuss.elastic.co/u/ikakavas)\
**Post date:** [February 25, 2021, 5:42pm UTC](https://discuss.elastic.co/t/encrypt-communication-b-w-kibana-and-elasticsearch/265527/2 "2021-02-25T17:42:20Z")

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> [@Aniket\_Pant](#):
>
> My kibana is showing **server is not ready yet**

Looks like your elasticsearch cluster did not start successfully. What do the elasticsearch logs say ?

> [@Aniket\_Pant](#):
>
> elasticsearch.ssl.certificateAuthorities should have .pem certificate but i have only ca.crt and ca.key.How can i generate the pem file ?

`.crt` and `.pem` are just file suffixes ,there is no difference. You can use ca.crt and ca.pem interchangeably, you can rename the file with no issues. Tim wrote an explanation recently, feel free to take a look in [Elastic stack issues Certificates and Kibana is not ready yet - #3 by TimV](https://discuss.elastic.co/t/elastic-stack-issues-certificates-and-kibana-is-not-ready-yet/264728/3)

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