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 Post subject: Solved: "authentication method unknown" during installation
PostPosted: Sun Aug 18, 2019 11:45 pm 
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Joined: Sun Aug 18, 2019 6:31 pm
Posts: 1

I ran into the following issue while installing CMSMS 2.3-beta6 on a CentOS 7 server, with Apache 2.4, PHP 7.3 and MySQL (Percona) 8.0.15. I installed from the PHAR file, i.e., cmsms-2.3-beta6-install.php.

After I created a MySQL user and database for CMSMS, I entered these details in the corresponding screen in the installation process, and got the following error:

The server requested authentication method unknown to the client

I found out that MySQL changed the default authentication plugin from mysql_native_password to caching_sha2_password as of version 8.0.4. You can read more about this here:
https://dev.mysql.com/doc/relnotes/mysq ... 8-0-4.html
https://dev.mysql.com/doc/refman/8.0/en ... 2-password

This has no effect when MySQL is upgraded in place for an existing CMSMS installation. The problem arises when a new database user is created, in MySQL version 8.0.4 or later.

mysql> CREATE USER 'cmsuser'@'localhost' IDENTIFIED WITH mysql_native_password BY 'YourPasswordHere';

This creates a database user while expressly selecting mysql_native_password authentication.

I trust that future versions of CMSMS (or perhaps I should say, future versions of the PHP MySQLi extension?) will support the newer SHA2 authentication mechanisms.

I am posting this here in hope that it may be useful to someone. I am new here, so if I posted in the wrong place then please point me in the right direction.


P.S. The eagle-eyed reader may have noticed that I'm on PHP 7.3, while CMSMS 2.3 officially calls for <=7.2. I'm pleased to say I've had no issues so far.

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 Post subject: Re: Solved: "authentication method unknown" during installat
PostPosted: Mon Aug 19, 2019 1:26 pm 
Dev Team Member
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Joined: Tue Oct 19, 2004 6:44 pm
Posts: 8166
Location: Fernie British Columbia, Canada
quick research says that the mysqli extension to PHP does not support this (yet).

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Please post system information from "Extensions >> System Information" (there is a bbcode option) on all posts asking for assistance.
If you can't bother explaining your problem well, you shouldn't expect much in the way of assistance.

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