So first it'd be good to know if you can connect ok to the server. So try that in your web browser (if you haven't already). Just type in the IP address. You noted 192.168.1.100, so I'm guessing that's what's showing in Virtualbox, assuming so, use that.

And if that works, please check the "Quick start" tab for further info.

For what it's worth, I'll repeat it here:

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Connection Hints

As per all previous releases, by default TurnKey MySQL (MariaDB) appliance listens on all interfaces via (default MySQL/MariaDB) port 3306.

However, since v16.0 there have been some changes...

New remote user username

As of v16.0+ the default "root-like" user is now named "remote".

SSL now enabled (and required) for the "remote" user

SSL is now enabled and required for remote TCP connections to the MySQL/MariaDB server. If desired it can be disabled (and re-enabled) via the Confconsole plugin (Advanced >> System Settings >> MySQL remote SSL) and/or the 'turnkey-mysql-ssl' commandline tool.

SSL details

Self-signed certificates, signed by a custom CA cert are all generated on firstboot and stored in '/etc/mysql/certificates'. To connect remotely via SSL, you will need to download the relevant files and configure your client to use these, or reconfigure it to your desires. The required files are:

/etc/mysql/certificates/ca.pem # The CA certifcate
/etc/mysql/certificates/cert.pem # The certificate file
/etc/mysql/certificates/cert.key # The key file

For example, to use the commandline MySQL/MariaDB client from another TurnKey instance, assuming that the files have been downloaded to the same local locations, the following lines are required in the MySQL/MariaDB client config ('/etc/mysql/mariadb.conf.d/50-client.cnf'):

ssl_ca = /etc/mysql/certificates/ca.pem
ssl-cert = /etc/mysql/certificates/cert.pem
ssl-key = /etc/mysql/certificates/cert.key

Note that the user who is launching the client must have read permission for these files.

Once configured, then connection should work as per usual remote MySQL/MariaDB connection. E.g.:

root@core ~# mysql -h remote-mysql.example.com -u remote -p
Enter password:
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 41
Server version: 10.3.22-MariaDB-0+deb10u1 Debian 10

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]>

Then to demonstrate that the connection is encrypted, you can use the '\s' command. I.e.:

MariaDB [(none)]> \s
--------------
mysql  Ver 15.1 Distrib 10.3.22-MariaDB, for debian-linux-gnu (x86_64) using readline 5.2

Connection id:		41
Current database:
Current user:		remote@remote-mysql.example.com
SSL:			Cipher in use is DHE-RSA-AES256-SHA
Current pager:		less -X -R -F
Using outfile:		''
Using delimiter:	;
Server:			MariaDB
Server version:		10.3.22-MariaDB-0+deb10u1 Debian 10
Protocol version:	10
Connection:		192.168.1.74 via TCP/IP
Server characterset:	utf8mb4
Db     characterset:	utf8mb4
Client characterset:	utf8mb4
Conn.  characterset:	utf8mb4
TCP port:		3306
Uptime:			34 min 12 sec

Threads: 7  Questions: 77  Slow queries: 0  Opens: 32  Flush tables: 1  Open tables: 26  Queries per second avg: 0.037
--------------

Note the ciper noted against "SSL:"! :)

Alternate configurations

There are a number of alternate configrations possible (including using "proper" CA signed certs) but you are on your own with those for now. Please see the MariaDB "Securing Connections" KB page for further ideas.

If you do configure this appliance to connect via SSL in alternate way and would like to share your config (please do!), and/or have any questions please feel free to post in the TurnKey forums.

For the most up to date details, please check the MySQL appliance page and/or the docs.