diff --git a/dyndomain b/dyndomain
index d1de13c..9162b1d 100755
--- a/dyndomain
+++ b/dyndomain
@@ -74,9 +74,11 @@ def ping(hostname):
 
 
 def get_hosts():
-    r = sysbus.requete('Devices:get')
-
+    r = sysbus.requete('Devices:get', silent=True)
     hosts = { 'A': {}, 'AAAA': {} }
+    if not r:
+        return hosts
+
     for h in r['status']:
         ns = {}
         for n in h['Names']:
@@ -102,8 +104,11 @@ def get_hosts():
 
 
 def get_wan_addr():
-    r = sysbus.requete('NMC:getWANStatus')
+    r = sysbus.requete('NMC:getWANStatus', silent=True)
     wan = dict()
+    if not r or not r.get('data') or not r['data'].get('IPAddress') or not r['data'].get('IPv6Address'):
+        log('get_wan_addr: {}'.format(r))
+        return None
     wan['ipv4'] = r['data']['IPAddress']
     wan['ipv6'] = r['data']['IPv6Address']
     if wan['ipv4'] == '0.0.0.0':
@@ -273,12 +278,12 @@ def livebox_rule_id(words):
 def livebox_delete_port_nat(port, addr):
     log('livebox: delete PortNat {} to {}'.format(port, addr))
     id = livebox_rule_id([port])
-    r = sysbus.requete('Firewall:deletePortForwarding', { 'id': id, 'origin': 'webui' })
+    r = sysbus.requete('Firewall:deletePortForwarding', { 'id': id, 'origin': 'webui' }, silent=True)
 
 def livebox_delete_pinhole(port, addr):
     log('livebox: delete pinhole {} to {}'.format(port, addr))
     id = livebox_rule_id([port, addr])
-    r = sysbus.requete('Firewall:deletePinhole', { 'id': id, 'origin': 'webui' })
+    r = sysbus.requete('Firewall:deletePinhole', { 'id': id, 'origin': 'webui' }, silent=True)
 
 def livebox_add_port_nat(port, addr):
     log('livebox: add PortNat {} to {}'.format(port, addr))
@@ -292,7 +297,7 @@ def livebox_add_port_nat(port, addr):
         'internalPort': port,
         'enable': True,
     }
-    r = sysbus.requete('Firewall:setPortForwarding', a)
+    r = sysbus.requete('Firewall:setPortForwarding', a, silent=True)
 
 def livebox_add_pinhole(port, addr):
     log('livebox: add pinhole {} to {}'.format(port, addr))
@@ -307,7 +312,7 @@ def livebox_add_pinhole(port, addr):
         'ipversion': '6',
         'enable': True,
     }
-    r = sysbus.requete('Firewall:setPinhole', a)
+    r = sysbus.requete('Firewall:setPinhole', a, silent=True)
 
 def livebox_update_fw(zone, update, sync_zone):
     for prot, addr, port in update['delete']:
@@ -372,13 +377,19 @@ if not ping(wan_hostname):
     sys.exit(0)
 
 sysbus.load_conf()
-r = sysbus.auth(False)
-if not r:
-    log('Error: cannot authenticate on livebox')
+try:
+    r = sysbus.auth(False)
+    if not r:
+        log('Error: cannot authenticate on livebox')
+        sys.exit(1)
+except Exception as e:
+    log('Error: %s'.format(e))
     sys.exit(1)
 
 hosts = get_hosts()
 wan = get_wan_addr()
+if not wan:
+    sys.exit(0)
 
 zone = read_zone_list(zone_filename)
 sync_zone = False