In cases where several hosts on the local net are supplying NIS services, it is possible for ypbind to rebind to another host even while you attempt to find out if the ypset operation succeeded. For example, you can type:
which can be confusing. This is a function of the NIS subsystem’s attempt to know always a running NIS server, and occurs when host1 does not respond to ypbind because it is not running ypserv (or is overloaded), and host2, running ypserv, gets the binding.
Server indicates the NIS server to bind to, and must be specified as a name or an IP address. This will work only if the node has a current valid binding for the domain in question, and ypbind has been set to allow use of ypset. In most cases, server should be specified as an IP address.