we have a user name "Test1" that account is alwyas locked out. The user has been used to many servers to ftp a file from the main server. i already increase the MaxStartups to 99. And still after how many days account will locked.
your question is not clear...
In the /etc/security/user file, set the "loginretries" to 0 ("loginretries = 0"). This should keep the user from locking itself out and fix your problem.
My guess is that you have a server that is failing the authentication every time it tries to FTP in. You may also want to check your failed logins to see if that is occuring by running this:
who /etc/security/failedlogins
There could be some program/script accessing this account using a wrong password... It will increase the failed login counts and the account gets locked out