Problem after NIS configuration

I tried to configure NIS in a server and a client both running Ubuntu 14.04 following this guide and this guide.

After a reboot the client machine got locked with this message several times repeated:

YPBINDPROC_DOMAIN: Domain not bound

any button couldn't be useful to exit and launch the GUI with a regular login.

I rebooted again disconnecting the network and then could log in with the GUI. But after reconnecting the network, it took several minutes to open a terminal emulator and other minutes to display the prompt (and sometimes it crashes). Ssh connection from another host is accepted but then closed by the server without a login.

During the configuration, what I noticed is that rpcbind was automatically installed instead of portmap (and I couldn't run the command sudo update-rc.d portmap defaults 10 at the beginning of the guide); moreover, the command

sudo /etc/init.d/rpcbind restart

worked; but

sudo /etc/init.d/nis restart

didn't work because there was no /etc/init.d/nis file neither in the client nor in the server. What does that mean? I installed NIS with sudo apt-get install nis!

And is it possible to recover from this situation?