diff --git a/policy.go b/policy.go
index ebf88ae..e2cacfc 100644
--- a/policy.go
+++ b/policy.go
@@ -326,9 +326,14 @@ func (ext *ACLExt) Field(name string) interface{} {
   })
 }
 
+var ErrorSignalAction = Action{"ERROR_RESP"}
+var DefaultACLPolicies = []Policy{
+  NewAllNodesPolicy(Actions{ErrorSignalAction}),
+}
+
 func NewACLExt(policies ...Policy) *ACLExt {
   policy_map := map[PolicyType]Policy{}
-  for _, policy := range(policies) {
+  for _, policy := range(append(policies, DefaultACLPolicies...)) {
     existing, exists := policy_map[policy.Type()]
     if exists == true {
       policy = existing.Merge(policy)
diff --git a/signal.go b/signal.go
index 5ec96d2..d82f2c4 100644
--- a/signal.go
+++ b/signal.go
@@ -148,6 +148,10 @@ type ErrorSignal struct {
   Error error `json:"error"`
 }
 
+func (signal ErrorSignal) Permission() Action {
+  return ErrorSignalAction
+}
+
 func NewErrorSignal(req_id uuid.UUID, err error) ErrorSignal {
   return ErrorSignal{
     BaseSignal: BaseSignal{