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-rw-r--r--synapse/handlers/federation_event.py6
1 files changed, 6 insertions, 0 deletions
diff --git a/synapse/handlers/federation_event.py b/synapse/handlers/federation_event.py
index 4bd87709f3..567afc910f 100644
--- a/synapse/handlers/federation_event.py
+++ b/synapse/handlers/federation_event.py
@@ -469,6 +469,12 @@ class FederationEventHandler:
             if context.rejected:
                 raise SynapseError(400, "Join event was rejected")
 
+            # the remote server is responsible for sending our join event to the rest
+            # of the federation. Indeed, attempting to do so will result in problems
+            # when we try to look up the state before the join (to get the server list)
+            # and discover that we do not have it.
+            event.internal_metadata.proactively_send = False
+
             return await self.persist_events_and_notify(room_id, [(event, context)])
 
     async def backfill(