Unable to add a system in ACC

Hello,

We are unable to add a new system in the ACC.Initially we addeed one system in the ACC and everything went fine but we are facing trouble while another system in the ACC.We are getting the following error " Hostname'loopback' is reported from host xxxxxxxx as well as from host xxxxxxx check your network setup! ".

I checked and found that the loopback address is same for both the hosts.

Is it necessary to have two seperate loop back adresses for adding in the ACC.

Regards,

Vamshi T