今天看日志发现一直被攻击着！

11/10/2008 13:31:23,登录,未知,Login failed for user 'sa'. [客户端: 125.65.*]
11/10/2008 13:31:23,登录,未知,Login failed for user 'sa'. [客户端: 125.65.*]
11/10/2008 13:31:22,登录,未知,Login failed for user 'sa'. [客户端: 125.65.*]
11/10/2008 13:31:22,登录,未知,Login failed for user 'sa'. [客户端: 125.65.*]
类似上面大量的日志，每天都有n多。。怎么办呢？默认端口1433,sa密码虽然复杂但也害怕，怎么防备？