Dear Sir, I have a small problem with NIS configuration. when I type this commande "ypcat hosts", I get this answer: "No such map hosts.byname.Reason: Can not estabilish a link with the server which serv this domain" Did you know where is the problem? (must I use "makedbm -c" in spite of "make -f ../Makefile all" or ...) Thank you for your answer and Happy new year....... ******************** NB: There is some information about my installation: domain name: nis.a22.TPnis ip of the nis server : 10.172.52.39 I have created the file /var/yp/nis.a22.TPnis I have added to /etc/yp.conf: nis.a22.TPnis server 10.172.52.39 ypserver 10.172.52.39 I have added to /etc/sysconfig/network: NISDOMAIN="nis.a22.TPnis" created /etc/domainname and added it this line: nis.a22.TPnis typed the following command: "domainname nis.a22.TPnis" added the following lines to /et/ypserv.conf: #host :domain :map :security :passwdmangle 10.172.52. :* :passwd.byname :port :yes 10.172.52. :* :passwd.byuid :port :yes I have donne /usr/lib/yp/ypinit -m created the file "/var/yp/securenets" with this content 255.0.0.0 127.0.0.0 255.0.0.0 10.172.52.0 created the maps cd /var/yp/nis.a22.TPnis/ make -f ../Makefile all restart the daemons ypserv restart yppasswdd restart when I type "domainname" I get this answer "nis.a22.TPnis" And when I type "ypwhch" I get "station_a22" (the name of my station which is in the same time my nis server) ##########o0o########## HAPPY NEW YEAR ##########o0o##########