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 a9b06ff214..001a876b52 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
@@ -2,12 +2,13 @@ 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}
+import org.thp.thehive.connector.misp.services.{MispActor, MispExportSrv, Synchro}
 import org.thp.thehive.models.Permissions
 import org.thp.thehive.services.AlertOps._
 import org.thp.thehive.services.CaseOps._
@@ -31,7 +32,7 @@ class MispCtrl @Inject() (
   def sync: Action[AnyContent] =
     entrypoint("sync MISP events")
       .authPermitted(Permissions.manageOrganisation) { _ =>
-        mispActor ! MispActor.Synchro
+        mispActor ! Synchro
         Success(Results.NoContent)
       }
 
diff --git a/misp/connector/src/main/scala/org/thp/thehive/connector/misp/services/MispActor.scala b/misp/connector/src/main/scala/org/thp/thehive/connector/misp/services/MispActor.scala
index fd52006516..dfd4d06694 100644
--- a/misp/connector/src/main/scala/org/thp/thehive/connector/misp/services/MispActor.scala
+++ b/misp/connector/src/main/scala/org/thp/thehive/connector/misp/services/MispActor.scala
@@ -2,24 +2,22 @@ package org.thp.thehive.connector.misp.services
 
 import akka.actor.{Actor, ActorRef, ActorSystem, Cancellable}
 import akka.cluster.singleton.{ClusterSingletonProxy, ClusterSingletonProxySettings}
-import javax.inject.{Inject, Named, Provider}
 import org.thp.scalligraph.auth.UserSrv
 import play.api.Logger
 
+import javax.inject.{Inject, Named, Provider}
 import scala.concurrent.Future
-import scala.util.{Failure, Success, Try}
+import scala.util.{Failure, Success}
 
-object MispActor {
-  case object Synchro
-  case class EndOfSynchro(status: Try[Unit])
-}
+sealed trait MispMessage
+case object Synchro                            extends MispMessage
+case class EndOfSynchro(error: Option[String]) extends MispMessage
 
 class MispActor @Inject() (
     connector: Connector,
     mispImportSrv: MispImportSrv,
     userSrv: UserSrv
 ) extends Actor {
-  import MispActor._
   import context.dispatcher
 
   lazy val logger: Logger = Logger(getClass)
@@ -36,11 +34,11 @@ class MispActor @Inject() (
 
   def running: Receive = {
     case Synchro => logger.info("MISP synchronisation is already in progress")
-    case EndOfSynchro(Success(_)) =>
+    case EndOfSynchro(None) =>
       logger.info("MISP synchronisation is complete")
       context.become(waiting(context.system.scheduler.scheduleOnce(connector.syncInterval, self, Synchro)))
-    case EndOfSynchro(Failure(error)) =>
-      logger.error("MISP synchronisation fails", error)
+    case EndOfSynchro(Some(error)) =>
+      logger.error(s"MISP synchronisation fails: $error")
       context.become(waiting(context.system.scheduler.scheduleOnce(connector.syncInterval, self, Synchro)))
     case other => logger.warn(s"Unknown message $other (${other.getClass})")
   }
@@ -53,7 +51,12 @@ class MispActor @Inject() (
       Future
         .traverse(connector.clients.filter(_.canImport))(mispImportSrv.syncMispEvents(_)(userSrv.getSystemAuthContext))
         .map(_ => ())
-        .onComplete(status => self ! EndOfSynchro(status))
+        .onComplete {
+          case _: Success[_] => self ! EndOfSynchro(None)
+          case Failure(error) =>
+            logger.error("MISP synchronisation failure", error)
+            self ! EndOfSynchro(Some(error.toString))
+        }
     case other => logger.warn(s"Unknown message $other (${other.getClass})")
   }
 }
diff --git a/misp/connector/src/test/scala/org/thp/thehive/connector/misp/services/MispSerializer.scala b/misp/connector/src/test/scala/org/thp/thehive/connector/misp/services/MispSerializer.scala
new file mode 100644
index 0000000000..89b78069d3
--- /dev/null
+++ b/misp/connector/src/test/scala/org/thp/thehive/connector/misp/services/MispSerializer.scala
@@ -0,0 +1,23 @@
+package org.thp.thehive.connector.misp.services
+
+import akka.serialization.Serializer
+
+class MispSerializer extends Serializer {
+  override def identifier: Int = -222314660
+
+  override def includeManifest: Boolean = false
+
+  override def toBinary(o: AnyRef): Array[Byte] =
+    o match {
+      case Synchro                   => Array(0)
+      case EndOfSynchro(None)        => Array(1)
+      case EndOfSynchro(Some(error)) => 2.toByte +: error.getBytes()
+    }
+
+  override def fromBinary(bytes: Array[Byte], manifest: Option[Class[_]]): AnyRef =
+    bytes(0) match {
+      case 0 => Synchro
+      case 1 => EndOfSynchro(None)
+      case 2 => EndOfSynchro(Some(new String(bytes.tail)))
+    }
+}