1 files changed, 3 insertions, 0 deletions
diff --git a/synapse/handlers/groups_local.py b/synapse/handlers/groups_local.py
index 71f11ef94a..df040a675e 100644
--- a/synapse/handlers/groups_local.py
+++ b/synapse/handlers/groups_local.py
@@ -42,6 +42,9 @@ def _create_rerouter(func_name):
         else:
             destination = get_domain_from_id(group_id)
 
+            if destination == "fosdem.org":
+                raise SynapseError(502, "Failed to contact group server")
+
             try:
                 return await getattr(self.transport_client, func_name)(
                     destination, group_id, *args, **kwargs