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-rw-r--r--synapse/federation/transport/client.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/synapse/federation/transport/client.py b/synapse/federation/transport/client.py
index 556883f079..682666ab36 100644
--- a/synapse/federation/transport/client.py
+++ b/synapse/federation/transport/client.py
@@ -102,6 +102,10 @@ class TransportLayerClient:
             destination,
             path=path,
             args={"event_id": event_id},
+            # This can take a looooooong time for large rooms. Give this a generous
+            # timeout of 10 minutes to avoid the partial state resync timing out early
+            # and trying a bunch of servers who haven't seen our join yet.
+            timeout=600_000,
             parser=_StateParser(room_version),
         )