I am also facing an issue to connect with Mariadb v10.11. My code,

MySqlConnection mySqlConn = new MySqlConnection("server=XXXXX;port=3306;database=XXXX;uid=XXXX;password=XXXX;commandinterceptors=Jf.MySql.Data.Collations.Interceptor,Jf.MySql.Data.Collations"); Utf8mb3.Enable(); mySqlConn.Open();

Note : Using above MySqlConnection i am able to connect with Mariadb 10.5 but its failing for Mariadb v10.11. I am using MySql.Data.dll (Ver: 6.9.8.0) and Jf.MySql.Data.Collations.dll ( Ver: 0.2.0.0).

What could be wrong here. Thanks!