proftpd与mysql连接问题

Jan 28 05:32:40 mod_sql/4.2.1[6413]: defaulting to 'postgres' backend
Jan 28 05:32:40 mod_sql/4.2.1[6413]: backend module 'mod_sql_postgres/4.02'
Jan 28 05:32:40 mod_sql/4.2.1[6413]: backend api    'mod_sql_api_v2'
Jan 28 05:32:40 mod_sql/4.2.1[6413]: >>> sql_sess_init
Jan 28 05:32:40 mod_sql/4.2.1[6413]: entering   postgres cmd_defineconnection
Jan 28 05:32:40 mod_sql/4.2.1[6413]:  name: 'default'
Jan 28 05:32:40 mod_sql/4.2.1[6413]:  user: 'root'
Jan 28 05:32:40 mod_sql/4.2.1[6413]:  host: 'localhost'
Jan 28 05:32:40 mod_sql/4.2.1[6413]:    db: 'proftpd'
Jan 28 05:32:40 mod_sql/4.2.1[6413]:  port: '3306'
Jan 28 05:32:40 mod_sql/4.2.1[6413]:   ttl: '0'
Jan 28 05:32:40 mod_sql/4.2.1[6413]: exiting    postgres cmd_defineconnection
Jan 28 05:32:40 mod_sql/4.2.1[6413]: entering   postgres cmd_open
Jan 28 05:32:40 mod_sql/4.2.1[6413]: exiting    postgres cmd_open
Jan 28 05:32:40 mod_sql/4.2.1[6413]: unrecoverable backend error
Jan 28 05:32:40 mod_sql/4.2.1[6413]: error: 'mod_sql_postgres/4.02'
Jan 28 05:32:40 mod_sql/4.2.1[6413]: message: 'received invalid response to SSL negotiation: B