When creating a new account, after running make on /var/yp on NIS server, the new id appears in passwd, group, aliases maps. When you try to login as new user, or su, you get "unknown login". When changing existing users passwords, ypasswd indicats NIS change on correct server. However, only the old password works. Another ypserver on the sub-net had been disabled a few weeks ago (friendly but renegade). Ypwhich on the clients and NIS server yields correct server name. HELP!