Discuz! Database Error

The database has encountered a problem. Need Help?

Error messages:

[Type] 无法连接到数据库服务器 [2005] Unknown MySQL server host 'rm-2zeq8bm2lmsoa6q6e824.mysql.rds.aliyuncs.com' (2)

Program messages:

[Line: 0055]forum.php(discuz_core->init) [Line: 0064]source/class/class_core.php(discuz_core->_init_db) [Line: 0359]source/class/class_core.php(db_mysql_slave->slave_connect) [Line: 0049]source/class/class_mysql_slave.php(db_mysql->_dbconnect)

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