installation problem with ssh

[Matthias.Lechner at med.uni-muenchen.de]

hi there!

i solved the problem at the beginning of installation by restoring my old
/fai/files/etc folder. now fai installs perfectly until the end. there the
wellknown message:

The authenticity of host [...] can't be established. RSA key fingerprint
is [...]. Are you sure you want to continue connecting? [yes/no]

appears again. after three "yes" i can reboot and the client works as it
is supposed to do. how do i stop that annoying message?

thank you very much in advance
mat.