# Mysql Server's hostname validation failure

**URL:** <https://forums.percona.com/t/mysql-servers-hostname-validation-failure/16496>\
**Category:** MySQL & MariaDB\
**Tags:** mysql\
**Created:** [July 10, 2022, 6:04am UTC](https://forums.percona.com/t/mysql-servers-hostname-validation-failure/16496 "2022-07-10T06:04:37Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![preethi\_subbu](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/preethi_subbu/32/3204_2.png) [@preethi\_subbu](https://forums.percona.com/u/preethi_subbu)\
**Post date:** [July 10, 2022, 6:04am UTC](https://forums.percona.com/t/mysql-servers-hostname-validation-failure/16496/1 "2022-07-10T06:04:37Z")

</div>

Getting `SSL connection error: SSL certificate validation failure`

Server-cert file’s CN has \*.domainname. Is it mandatory to mention the full host name ? ([subdomain.domain.com](http://subdomain.domain.com))

Any leads would be really helpful.

---

<div class="post-metadata">

**Author:** ![danarashad](https://avatars.discourse-cdn.com/v4/letter/d/7ab992/32.png) [@danarashad](https://forums.percona.com/u/danarashad)\
**Post date:** [July 10, 2022, 5:40pm UTC](https://forums.percona.com/t/mysql-servers-hostname-validation-failure/16496/2 "2022-07-10T17:40:28Z")

</div>

Copy the cert from from the donor mysql to the joiner.