How to log at a NIS client with local user?

[Markos <markos@c2o.pro.br>]

Dear,

For the first time, I configured a NIS service on a small network.

Now I observed that if the NIS server is turned off, the NIS client can
not load the login screen. So I'm not able to log even as local user in
client nis machine.

What can I do to login as local user in a client nis machine when the
nis server is off?

Is it possible?

Thanks,
Markos