diff --git a/tests/test_exeptions_500.py b/tests/test_exeptions_500.py
new file mode 100644
index 0000000..5e95ca2
--- /dev/null
+++ b/tests/test_exeptions_500.py
@@ -0,0 +1,55 @@
+import unittest
+import threading
+import http.server
+import socketserver
+import sys
+import os
+import time
+sys.path.append("..")
+from osc_sdk_python import Gateway
+from requests import HTTPError
+
+class Send500(http.server.BaseHTTPRequestHandler):
+    def do_POST(self):
+        self.send_response(500)
+        self.send_header('Content-type', 'application/json')
+        self.send_header("x-amz-requestid", "00000001")
+        self.end_headers()
+        self.wfile.write(b'{"error": "Internal Server Error", "message": "test", "__type": 9}')
+
+class TestServerError(unittest.TestCase):
+    @classmethod
+    def setUpClass(cls):
+        cls.server = None
+        cls.thread = None
+
+        # Start the server
+        def start_server():
+            with socketserver.TCPServer(('localhost', 8000), Send500) as httpd:
+                cls.server = httpd
+                httpd.serve_forever()
+
+        cls.thread = threading.Thread(target=start_server)
+        cls.thread.daemon = True
+        cls.thread.start()
+
+        # Wait a bit for the server to start
+        time.sleep(1)
+
+    @classmethod
+    def tearDownClass(cls):
+        if cls.server:
+            cls.server.shutdown()
+            cls.thread.join()
+
+    def test_server_error(self):
+        url = 'http://localhost:8000'
+        ak = os.environ.pop("OSC_ENDPOINT_API", None)
+        os.environ['OSC_ENDPOINT_API'] = "http://127.0.0.1:8000"
+        gw = Gateway()
+        # a is not a valide argument
+        with self.assertRaises(HTTPError):
+            gw.ReadVms()
+
+if __name__ == '__main__':
+    unittest.main()