Mosix on Debian systems doesn't configure the system services yet. Hence, one has to patch /etc/inittab, /etc/inetd.conf, and other services such as ssh etc. by hand, so that they don't migrate to other nodes. This is currently not done, as it can be potentially dangerous, when other packages override the changes or install newer versions of configuration files. A good policy can be to set the policy to 'don't migrate' by default unless the user specifically asks for it.
The README that comes along with mosix explains these issues quite well.