diff --git a/pybsn/__init__.py b/pybsn/__init__.py
index 904860b0..42f3c7e8 100644
--- a/pybsn/__init__.py
+++ b/pybsn/__init__.py
@@ -667,7 +667,6 @@ def _attempt_login(
     session_cookie = requests.cookies.create_cookie(
         name="session_cookie",
         value=json_["session-cookie"],
-        domain=parsed_url.hostname,
         path=session_cookie_path,  # type: ignore[arg-type]
     )
     session.cookies.set_cookie(session_cookie)
diff --git a/test/test_auth.py b/test/test_auth.py
new file mode 100644
index 00000000..339428b2
--- /dev/null
+++ b/test/test_auth.py
@@ -0,0 +1,39 @@
+import json
+import unittest
+from unittest.mock import patch
+
+import requests
+
+import pybsn
+
+
+class TestAuth(unittest.TestCase):
+    def test_attempt_login_posts_credentials_and_stores_session_cookie(self):
+        session = requests.Session()
+        response = requests.Response()
+        response.status_code = 200
+        response.json = lambda: {"session-cookie": "some_token"}
+
+        with patch.object(pybsn, "logged_request", return_value=response) as mock_logged_request:
+            pybsn._attempt_login(session, "http://127.0.0.1:8080", "admin", "somepassword")
+
+        _, request = mock_logged_request.call_args.args
+        self.assertEqual(request.method, "POST")
+        self.assertEqual(request.url, "http://127.0.0.1:8080/api/v1/rpc/controller/core/aaa/session/login")
+        self.assertEqual(json.loads(request.data), {"user": "admin", "password": "somepassword"})
+        self.assertEqual(session.cookies.get_dict(), {"session_cookie": "some_token"})
+
+    def test_attempt_login_cookie_matches_ipv4_and_ipv6_urls(self):
+        for url in ("http://127.0.0.1:8080", "https://[fdfd::1]:8443"):
+            with self.subTest(url=url):
+                session = requests.Session()
+                response = requests.Response()
+                response.status_code = 200
+                response.json = lambda: {"session-cookie": "some_token"}
+
+                with patch.object(pybsn, "logged_request", return_value=response):
+                    pybsn._attempt_login(session, url, "admin", "somepassword")
+
+                request = requests.Request("GET", url + "/api/v1/data/controller/test")
+                prepared_request = session.prepare_request(request)
+                self.assertEqual(prepared_request.headers["Cookie"], "session_cookie=some_token")