ange-ftp-skip-msgs is a variable defined in `ange-ftp.el'.
Its value is

"^200 \\(PORT\\|Port\\) \\|^331 \\|^150 \\|^350 \\|^[0-9]+ bytes \\|^Connected \\|^$\\|^Remote system\\|^Using\\|^ \\|Password:\\|^Data connection \\|^local:\\|^Trying\\|^125 \\|^550-\\|^221 .*oodbye\\|^500 .*AUTH\\|^KERBEROS\\|^500 This security scheme is not implemented\\|^504 Unknown security mechanism\\|^530 Please login with USER and PASS\\|^534 Kerberos Authentication not enabled\\|^22[789] .*[Pp]assive\\|^200 EPRT\\|^500 .*EPRT\\|^500 .*EPSV"

Regular expression matching FTP messages that can be ignored.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 24.4 of Emacs.