Em / etc / sysconfig / autofs, altere a variável MOUNT_NFS_DEFAULT_PROTOCOL.
# MOUNT_NFS_DEFAULT_PROTOCOL - specify the default protocol used by
# mount.nfs(8). Since we can't identify
# the default automatically we need to
# set it in our configuration. This will
# only make a difference for replicated
# map entries as availability probing isn't
# used for single host map entries.
#
#MOUNT_NFS_DEFAULT_PROTOCOL=3
MOUNT_NFS_DEFAULT_PROTOCOL=4