diff --git a/cortex/connector/src/main/resources/play/reference-overrides.conf b/cortex/connector/src/main/resources/play/reference-overrides.conf
index 346ac6866c..324d422143 100644
--- a/cortex/connector/src/main/resources/play/reference-overrides.conf
+++ b/cortex/connector/src/main/resources/play/reference-overrides.conf
@@ -2,10 +2,12 @@ akka {
   actor {
     serializers {
       cortex-schema-updater = "org.thp.thehive.connector.cortex.models.SchemaUpdaterSerializer"
+      cortex-jobs = "org.thp.thehive.connector.cortex.services.CortexSerializer"
     }
 
     serialization-bindings {
       "org.thp.thehive.connector.cortex.models.SchemaUpdaterMessage" = cortex-schema-updater
+      "org.thp.thehive.connector.cortex.services.CortexActorMessage" = cortex-jobs
     }
   }
 }
diff --git a/cortex/connector/src/main/scala/org/thp/thehive/connector/cortex/services/CortexActor.scala b/cortex/connector/src/main/scala/org/thp/thehive/connector/cortex/services/CortexActor.scala
index 93f9cb1a92..aaf59bbb35 100644
--- a/cortex/connector/src/main/scala/org/thp/thehive/connector/cortex/services/CortexActor.scala
+++ b/cortex/connector/src/main/scala/org/thp/thehive/connector/cortex/services/CortexActor.scala
@@ -1,17 +1,15 @@
 package org.thp.thehive.connector.cortex.services
 
-import java.util.Date
 import akka.actor._
 import akka.pattern.pipe
-
-import javax.inject.Inject
 import org.thp.client.ApplicationError
 import org.thp.cortex.dto.v0.{JobStatus, JobType, OutputJob}
 import org.thp.scalligraph.EntityId
 import org.thp.scalligraph.auth.AuthContext
 import play.api.Logger
-import play.api.libs.json.{Json, OFormat}
 
+import java.util.Date
+import javax.inject.Inject
 import scala.concurrent.ExecutionContext
 import scala.concurrent.duration._
 
diff --git a/misp/connector/src/main/scala/org/thp/thehive/connector/misp/controllers/v0/MispCtrl.scala b/misp/connector/src/main/scala/org/thp/thehive/connector/misp/controllers/v0/MispCtrl.scala
index 001a876b52..ddccfd7d66 100644
--- a/misp/connector/src/main/scala/org/thp/thehive/connector/misp/controllers/v0/MispCtrl.scala
+++ b/misp/connector/src/main/scala/org/thp/thehive/connector/misp/controllers/v0/MispCtrl.scala
@@ -2,19 +2,18 @@ package org.thp.thehive.connector.misp.controllers.v0
 
 import akka.actor.ActorRef
 import com.google.inject.name.Named
-
-import javax.inject.{Inject, Singleton}
 import org.thp.scalligraph.EntityIdOrName
 import org.thp.scalligraph.controllers.Entrypoint
 import org.thp.scalligraph.models.Database
 import org.thp.scalligraph.traversal.TraversalOps._
-import org.thp.thehive.connector.misp.services.{MispActor, MispExportSrv, Synchro}
+import org.thp.thehive.connector.misp.services.{MispExportSrv, Synchro}
 import org.thp.thehive.models.Permissions
 import org.thp.thehive.services.AlertOps._
 import org.thp.thehive.services.CaseOps._
 import org.thp.thehive.services.{AlertSrv, CaseSrv}
 import play.api.mvc.{Action, AnyContent, Results}
 
+import javax.inject.{Inject, Singleton}
 import scala.concurrent.{ExecutionContext, Future}
 import scala.util.Success
 
diff --git a/thehive/app/org/thp/thehive/services/notification/NotificationSerializer.scala b/thehive/app/org/thp/thehive/services/notification/NotificationSerializer.scala
index 5f93113634..6a6a578708 100644
--- a/thehive/app/org/thp/thehive/services/notification/NotificationSerializer.scala
+++ b/thehive/app/org/thp/thehive/services/notification/NotificationSerializer.scala
@@ -15,9 +15,9 @@ class NotificationSerializer extends Serializer {
     */
   def toBinary(o: AnyRef): Array[Byte] =
     o match {
-      case m: NotificationExecution    => Json.toBytes(Json.toJson(m))
-      case m: AuditNotificationMessage => Json.toBytes(Json.toJson(m))
-      case _                           => Array.empty[Byte] // Not serializable
+      case m: NotificationExecution    => 0.toByte +: Json.toBytes(Json.toJson(m))
+      case m: AuditNotificationMessage => 1.toByte +: Json.toBytes(Json.toJson(m))
+      case _                           => throw new NotSerializableException
     }
 
   /**
@@ -26,11 +26,9 @@ class NotificationSerializer extends Serializer {
     */
   @throws(classOf[NotSerializableException])
   def fromBinary(bytes: Array[Byte], manifest: Option[Class[_]]): AnyRef =
-    manifest
-      .flatMap {
-        case c if c == classOf[NotificationExecution]    => Json.parse(bytes).asOpt[NotificationExecution]
-        case c if c == classOf[AuditNotificationMessage] => Json.parse(bytes).asOpt[AuditNotificationMessage]
-        case _                                           => None
-      }
-      .getOrElse(throw new NotSerializableException)
+    bytes(0) match {
+      case 0 => Json.parse(bytes.tail).asOpt[NotificationExecution]
+      case 1 => Json.parse(bytes.tail).asOpt[AuditNotificationMessage]
+      case _ => throw new NotSerializableException
+    }
 }