Merge remote-tracking branch 'origin/develop' into matrix-org-hotfixes

1 files changed, 3 insertions, 1 deletions

diff --git a/synapse/handlers/acme.py b/synapse/handlers/acme.py

index 5ecb2da1ac..132be238dd 100644
--- a/synapse/handlers/acme.py
+++ b/synapse/handlers/acme.py
@@ -73,7 +73,9 @@ class AcmeHandler:
                 "Listening for ACME requests on %s:%i", host, self.hs.config.acme_port
             )
             try:
-                self.reactor.listenTCP(self.hs.config.acme_port, srv, interface=host)
+                self.reactor.listenTCP(
+                    self.hs.config.acme_port, srv, backlog=50, interface=host
+                )
             except twisted.internet.error.CannotListenError as e:
                 check_bind_error(e, host, bind_addresses)