diff --git a/src/daemon/ca/certauth.rs b/src/daemon/ca/certauth.rs
index 8269b103..01e7d8ad 100644
--- a/src/daemon/ca/certauth.rs
+++ b/src/daemon/ca/certauth.rs
@@ -286,6 +286,9 @@ impl<S: Signer> Aggregate for CertAuth<S> {
                     .unwrap()
                     .old_key_removed();
             }
+            EvtDet::UnexpectedKeyFound(_, _) => {
+                // no action needed, this is marked to flag that a key may be removed
+            }
 
             //-----------------------------------------------------------------------
             // Route Authorizations
@@ -955,6 +958,15 @@ impl<S: Signer> CertAuth<S> {
             .ok_or_else(|| Error::CaParentUnknown(self.handle.clone(), parent.clone()))
     }
 
+    /// Find the parent for a given resource class name.
+    pub fn parent_for_rc(&self, rcn: &ResourceClassName) -> KrillResult<&ParentHandle> {
+        let rc = self
+            .resources
+            .get(rcn)
+            .ok_or_else(|| Error::ResourceClassUnknown(rcn.clone()))?;
+        Ok(rc.parent_handle())
+    }
+
     /// Adds a parent. This method will return an error in case a parent
     /// by this name (handle) is already known.
     fn add_parent(&self, parent: Handle, info: ParentCaContact) -> KrillResult<Vec<Evt>> {
@@ -1053,7 +1065,7 @@ impl<S: Signer> CertAuth<S> {
     ) -> KrillResult<Vec<Evt>> {
         let repo = self.get_repository_contact()?;
         let parent_class_name = entitlement.class_name().clone();
-        let req_details_list = rc.make_request_events(entitlement, repo.repo_info(), signer)?;
+        let req_details_list = rc.make_entitlement_events(entitlement, repo.repo_info(), signer)?;
 
         let mut res = vec![];
         for details in req_details_list.into_iter() {
diff --git a/src/daemon/ca/events.rs b/src/daemon/ca/events.rs
index 8e5dc943..4faa9c66 100644
--- a/src/daemon/ca/events.rs
+++ b/src/daemon/ca/events.rs
@@ -247,6 +247,7 @@ pub enum EvtDet {
     KeyPendingToActive(ResourceClassName, CertifiedKey, ObjectsDelta),
     KeyRollActivated(ResourceClassName, RevocationRequest),
     KeyRollFinished(ResourceClassName, ObjectsDelta),
+    UnexpectedKeyFound(ResourceClassName, RevocationRequest),
 
     // Route Authorizations
     RouteAuthorizationAdded(RouteAuthorization),
@@ -555,6 +556,11 @@ impl fmt::Display for EvtDet {
                 "key roll: finished for resource class '{}'",
                 rcn
             ),
+            EvtDet::UnexpectedKeyFound(rcn, revoke) => write!(
+                f,
+                "Found unexpected key in resource class '{}', will try to revoke key id: '{}'",
+                rcn, revoke.key()
+            ),
 
             // Route Authorizations
             EvtDet::RouteAuthorizationAdded(route) => write!(
diff --git a/src/daemon/ca/keys.rs b/src/daemon/ca/keys.rs
index 61b10fd7..ec70356b 100644
--- a/src/daemon/ca/keys.rs
+++ b/src/daemon/ca/keys.rs
@@ -323,7 +323,7 @@ impl KeyState {
         }
     }
 
-    pub fn request_certs<S: Signer>(
+    pub fn make_entitlement_events<S: Signer>(
         &self,
         rcn: ResourceClassName,
         entitlement: &EntitlementClass,
@@ -379,6 +379,17 @@ impl KeyState {
             res.push(EvtDet::CertificateRequested(rcn.clone(), req, *key_id));
         }
 
+        for key in entitlement
+            .issued()
+            .iter()
+            .map(|c| c.subject_key_identifier())
+        {
+            if !self.knows_key(key) {
+                let revocation = RevocationRequest::new(entitlement.class_name().clone(), key);
+                res.push(EvtDet::UnexpectedKeyFound(rcn.clone(), revocation));
+            }
+        }
+
         Ok(res)
     }
 
@@ -572,4 +583,16 @@ impl KeyState {
             _ => false,
         }
     }
+
+    fn knows_key(&self, key_id: KeyIdentifier) -> bool {
+        match self {
+            KeyState::Pending(pending) => pending.key_id == key_id,
+            KeyState::Active(current) => current.key_id == key_id,
+            KeyState::RollPending(pending, current) => {
+                pending.key_id == key_id || current.key_id == key_id
+            }
+            KeyState::RollNew(new, current) => new.key_id == key_id || current.key_id == key_id,
+            KeyState::RollOld(current, old) => current.key_id == key_id || old.key_id == key_id,
+        }
+    }
 }
diff --git a/src/daemon/ca/rc.rs b/src/daemon/ca/rc.rs
index 06703ab9..b97823a6 100644
--- a/src/daemon/ca/rc.rs
+++ b/src/daemon/ca/rc.rs
@@ -327,13 +327,18 @@ impl ResourceClass {
     }
 
     /// Request certificates for any key that needs it.
-    pub fn make_request_events<S: Signer>(
+    /// Also, create revocation events for any unexpected keys to recover from
+    /// issues where the parent believes we have keys that we do not know. This
+    /// can happen in corner cases where re-initialisation of Krill as a child
+    /// is done without proper revocation at the parent, or as is the case with
+    /// ARIN - Krill is sometimes told to just drop all resources.
+    pub fn make_entitlement_events<S: Signer>(
         &self,
         entitlement: &EntitlementClass,
         base_repo: &RepoInfo,
         signer: &S,
     ) -> KrillResult<Vec<EvtDet>> {
-        self.key_state.request_certs(
+        self.key_state.make_entitlement_events(
             self.name.clone(),
             entitlement,
             base_repo,
diff --git a/src/daemon/ca/server.rs b/src/daemon/ca/server.rs
index 73be1024..59a17c26 100644
--- a/src/daemon/ca/server.rs
+++ b/src/daemon/ca/server.rs
@@ -578,6 +578,20 @@ impl<S: Signer> CaServer<S> {
         }
     }
 
+    pub fn send_revoke_unexpected_key(
+        &self,
+        handle: &Handle,
+        rcn: ResourceClassName,
+        revocation: RevocationRequest,
+    ) -> KrillResult<HashMap<ResourceClassName, Vec<RevocationResponse>>> {
+        let child = self.ca_store.get_latest(handle)?;
+        let parent = child.parent_for_rc(&rcn)?;
+        let mut requests = HashMap::new();
+        requests.insert(rcn, vec![revocation]);
+
+        self.send_revoke_requests(handle, parent, requests)
+    }
+
     fn send_revoke_requests_embedded(
         &self,
         revoke_requests: HashMap<ResourceClassName, Vec<RevocationRequest>>,
diff --git a/src/daemon/endpoints.rs b/src/daemon/endpoints.rs
index 95e475a5..5b8b163a 100644
--- a/src/daemon/endpoints.rs
+++ b/src/daemon/endpoints.rs
@@ -656,7 +656,7 @@ pub fn ca_add_parent_xml(
     };
 
     let req = if string.starts_with("<repository") {
-        return server_error(Error::CaParentResponseWrongXml(ca.clone()));
+        return server_error(Error::CaParentResponseWrongXml(ca));
     } else {
         let res = match rfc8183::ParentResponse::validate(string.as_bytes())
             .map_err(|e| Error::CaParentResponseInvalidXml(ca.clone(), e.to_string()))
diff --git a/src/daemon/mq.rs b/src/daemon/mq.rs
index a49cc3d8..e1202f17 100644
--- a/src/daemon/mq.rs
+++ b/src/daemon/mq.rs
@@ -38,6 +38,14 @@ pub enum QueueEvent {
         HashMap<ResourceClassName, Vec<RevocationRequest>>,
     ),
 
+    #[display(
+        fmt = "unexpected key found for '{}' version '{}' resource class: '{}'",
+        _0,
+        _1,
+        _2
+    )]
+    UnexpectedKey(Handle, u64, ResourceClassName, RevocationRequest),
+
     #[display(fmt = "clean up old repo *if it exists* for '{}' version '{}'", _0, _1)]
     CleanOldRepo(Handle, u64),
 }
diff --git a/src/daemon/scheduler.rs b/src/daemon/scheduler.rs
index ce337d23..9a7568b5 100644
--- a/src/daemon/scheduler.rs
+++ b/src/daemon/scheduler.rs
@@ -80,6 +80,19 @@ fn make_event_sh(
                         just before removing the resource class entitlements.");
                     }
                 }
+                QueueEvent::UnexpectedKey(handle, _, rcn, revocation) => {
+                    trace!(
+                        "Trigger sending revocation requests for unexpected key with id '{}' in RC '{}'",
+                        revocation.key(),
+                        rcn
+                    );
+                    if caserver
+                        .send_revoke_unexpected_key(&handle, rcn, revocation)
+                        .is_err()
+                    {
+                        debug!("Could not revoke unexpected surplus key at parent.");
+                    }
+                }
                 QueueEvent::ParentAdded(handle, _, parent) => {
                     trace!(
                         "Get updates for '{}' from added parent '{}'.",