Wait for server to start before connecting

src/everest/gui/main_window.py

@@ -28,7 +28,7 @@
 from ert.run_models.event import StatusEvents, status_event_from_json
 from ert.run_models.everest_run_model import EverestRunModel, logger
 from everest.config import EverestConfig, ServerConfig
-from everest.detached import _query_server
+from everest.detached import _query_server, wait_for_server
 from everest.strings import OPT_PROGRESS_ENDPOINT
 
 
@@ -64,6 +64,7 @@ def _connect_to_events_endpoint(
     ) -> queue.SimpleQueue[StatusEvents]:
         # Connect to websockets endpoint and create a queue from it, then
         # pass it in, should function the same.
+        wait_for_server(output_dir, 60)
         server_context = ServerConfig.get_server_context(output_dir)
         url, cert, auth = server_context
         opt_endpoint = "/".join([url, OPT_PROGRESS_ENDPOINT])