fixes and improvements

backend/src/media_library_viewer_api/routers/settings.py

@@ -13,7 +13,7 @@ from media_library_viewer_api.clients.ssh import RemoteSSHClient
 from media_library_viewer_api.config import get_settings
 from media_library_viewer_api.dependencies import get_monitoring_poller, get_settings_store
 from media_library_viewer_api.services.db_maintenance import remove_sqlite_database
-from media_library_viewer_api.services.known_hosts import ensure_known_host
+from media_library_viewer_api.services.known_hosts import has_known_host
 from media_library_viewer_api.services.media_index import MediaIndex
 from media_library_viewer_api.services.settings_store import SettingsStore
 
@@ -98,20 +98,7 @@ def test_machine_ssh(
 
     client, host, port = _resolve_ssh_client(machine, store)
     settings = get_settings()
-    try:
-        known_hosts_updated = ensure_known_host(host, port, settings.ssh_known_hosts_file, strict=True)
-    except RuntimeError as exc:
-        message = str(exc)
-        lowered = message.lower()
-        if "protocol banner" in lowered:
-            raise HTTPException(
-                status_code=status.HTTP_502_BAD_GATEWAY,
-                detail=(
-                    f"SSH banner not received from {host}:{port}; the backend could not record the host key. "
-                    "Confirm the SSH service, host, and port are reachable."
-                ),
-            ) from exc
-        raise HTTPException(status_code=status.HTTP_502_BAD_GATEWAY, detail=message) from exc
+    known_hosts_updated = not has_known_host(host, port, settings.ssh_known_hosts_file)
 
     try:
         client.connect()