diff --git a/docker-compose.yml b/docker-compose.yml
index 866f59f..4982022 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -98,8 +98,17 @@ services:
       PG_PASSWORD: prosody
       PG_DB: prosody
       MOCK_URL: http://mocks:8080    # for side-effect assertions
+      # The tester reaches prosody directly by service name (http://prosody:5280),
+      # so aiohttp sends Host: prosody — which Prosody rejects as an unknown
+      # vhost (404 "Unknown host"). Send the real XMPP domain so HTTP routing
+      # lands on the example.com VirtualHost that serves mod_http_rest /rest.
+      REST_HOST_HEADER: example.com
     volumes:
       - ./tests:/tests
+      # Surface the repo config/ dir so static tests (test_04_infra
+      # healthcheck source checks) can resolve ../config/healthcheck.sh
+      # from inside the container.
+      - ./config:/config:ro
 
 volumes:
   pgdata:
diff --git a/tests/test_11_smokes.py b/tests/test_11_smokes.py
index be0927c..d41fca4 100644
--- a/tests/test_11_smokes.py
+++ b/tests/test_11_smokes.py
@@ -163,7 +163,7 @@ class TestAdminTelnetNonLoopback:
             reader, writer = await asyncio.wait_for(
                 asyncio.open_connection(host, port), timeout=5
             )
-            data = await asyncio.wait_for(reader.read(256), timeout=5)
+            data = await asyncio.wait_for(reader.read(1024), timeout=5)
             writer.close()
             await writer.wait_closed()
         except (OSError, asyncio.TimeoutError) as e: