diff --git a/src/DIRAC/Core/DISET/private/Service.py b/src/DIRAC/Core/DISET/private/Service.py
index fc12133c905..1729f96f9f0 100644
--- a/src/DIRAC/Core/DISET/private/Service.py
+++ b/src/DIRAC/Core/DISET/private/Service.py
@@ -511,6 +511,7 @@ def _processProposal(self, trid, proposalTuple, handlerObj):
         # Notify the client we're ready to execute the action
         retVal = self._transportPool.send(trid, S_OK())
         if not retVal["OK"]:
+            retVal["closeTransport"] = True
             return retVal
 
         messageConnection = False