这种暴力破解问题怎么更好的预防？

fanxuebin

pure-ftp有暴力破解

Mar 21 01:35:18 ebs-19721 pure-ftpd: (?@220.166.0.145) [INFO] Logout.

Mar 21 01:35:18 ebs-19721 pure-ftpd: (?@220.166.0.145) [INFO] New connection from 220.166.0.145

Mar 21 01:35:21 ebs-19721 pure-ftpd: (?@127.0.0.1) [WARNING] Authentication failed for user [zijidelu_test]

Mar 21 01:35:23 ebs-19721 pure-ftpd: (?@220.166.0.145) [WARNING] Authentication failed for user [cheeraincom]

Mar 21 01:35:24 ebs-19721 pure-ftpd: (?@220.166.0.145) [INFO] Logout.

Mar 21 01:35:24 ebs-19721 pure-ftpd: (?@220.166.0.145) [INFO] New connection from 220.166.0.145

Mar 21 01:35:29 ebs-19721 pure-ftpd: (?@220.166.0.145) [WARNING] Authentication failed for user [webmaster@cheerain.com]

Mar 21 01:35:29 ebs-19721 pure-ftpd: (?@220.166.0.145) [INFO] Logout.

Mar 21 01:35:29 ebs-19721 pure-ftpd: (?@220.166.0.145) [INFO] New connection from 220.166.0.145

fanxuebin

希望后台有修改默认端口的地方，以及基本的安全限制和资源监控管理