Rob Kampen wrote: Hello, nfs4 with kerberos works fine here on CentOS 5.6. > change exports to >[...]gss/krb([...] >[...]gss/krb([...] My /etc/exports says '... gss/krb5(...'. And 'SECURE_NFS="yes"' is set in /etc/sysconfig/nfs. All needed services are running? - rpcsvcgssd (server) - rpcidmapd (server) - rpcgssd (client) A very good instruction, in my opinion, to get it running is http://sadiquepp.blogspot.com/2009/02/how-to-configure-nfsv4-with-kerberos-in.html. regards Olaf