After installation, several lines in the /etc/nfssec.conf file are left commented, thus preventing use of Kerberos V5 with NFS.
Workaround: Remove comment indicator (#) at the beginning of the following lines in the /etc/nfssec.conf file:
#krb5 390003 kerberos_v5 default - #RPCSEC_GSS
#krb5i 390004 kerberos_v5 default integrity #RPCSEC_GSS