Customer applied testfix, T6C3024.
After that, ftp command which try to connect Linux server does not work .
After he stop Privileged Identity Manager(a.k.a CA PIM), ftp command worked normally.
So, he believe it is regression on T6C3024.
For example, error message on Redhat Enterprise Linux 7.2(x64)
$ ftp localhost
Connected to localhost (::1).
Connected to localhost (127.0.0.1).
220 (vsFTPd 3.0.2)
Name (localhost:root): tusr00
331 Please specify the password.
500 OOPS: not a normal exit in vsf_sysutil_wait_get_exitcode
421 Service not available, remote server has closed connection
And then it may crash vsftpd process.