diff --git a/src/caosdb/connection/connection.py b/src/caosdb/connection/connection.py
index 992efd60d4d1c37ac3a407ab744a31842f34b43b..701eedb9d8a2064f08d9f48126b97191af1d91ec 100644
--- a/src/caosdb/connection/connection.py
+++ b/src/caosdb/connection/connection.py
@@ -197,6 +197,8 @@ class _DefaultCaosDBServerConnection(CaosDBServerConnection):
                                           "`{}`: {}".format(config["cacert"],
                                                             exc))
 
+        context.load_default_certs()
+
         if "url" in config:
             parsed_url = parse_url(config["url"])
             host = parsed_url.netloc