diff --git a/src/users/views.py b/src/users/views.py
index 48e45912b3208917e08a5cbc07dfa261d102529b..4caf2037173e0ece4cee8cb4113f70efb305c075 100644
--- a/src/users/views.py
+++ b/src/users/views.py
@@ -40,7 +40,9 @@ def perform_login(request):
                         executor = settings.TEST_REMOTE_USER
                         executor_password = settings.TEST_REMOTE_PASSWD
                     else:
-                        executor = username
+                        # The authentication backend is case-insensitive, but the user
+                        # home directories in the analysis clusters are all lowercase.
+                        executor = username.lower()
                         executor_password = password
                     # create SSH key associated to the custodian browser session
                     public_key_file = IdentityFileModel.objects.create_from_custodian(