Network access denied by access control list (ACL)
PL/SQL 程序尝试进行网络调用（UTL_HTTP、UTL_TCP、UTL_SMTP 等），但用户没有目标主机所需的 ACL 权限。
SELECT host, lower_port, upper_port, acl FROM dba_network_acls;SELECT acl, principal, privilege, is_grant FROM dba_network_acl_privileges;SELECT * FROM dba_host_aces;