The situation: i have a AD server with samba4,all clients
ssh-kerberos works fine,except hpux 
wich works
only for few days..then i must re-export(sic!) the keys with
samba-tool domain exportkeytab 11.keytab --principal=host/hpux.fqdn
Why after few days ssh return error "server not found in kebreros db"?