diff --git a/server/src/tests/REST/test_actor.py b/server/src/tests/REST/test_actor.py
index f676ac358..eae236998 100644
--- a/server/src/tests/REST/test_actor.py
+++ b/server/src/tests/REST/test_actor.py
@@ -28,33 +28,95 @@
 """
 @author: Adolfo Gómez, dkmaster at dkmon dot com
 """
-import random
 import typing
-
+import logging
 
 from django.test import TestCase
 from django.test.client import Client
 from django.conf import settings
 
+from uds.REST.handlers import AUTH_TOKEN_HEADER
+
 from .. import fixtures, tools
 
 
-class RESTLoginLogoutCase(TestCase):
+logger = logging.getLogger(__name__)
+
+class RESTActorCase(TestCase):
     """
-    Test login and logout
+    Test actor functionality
     """
 
-    def setUp(self):
+    def setUp(self) -> None:
         self.client = tools.getClient()
 
-    def test_register_actor(self):
+    def test_register_actor(self) -> None:
+        """
+        Test actor rest api registration
+        """
+
+        def data(chars: typing.Optional[str] = None) -> typing.Dict[str, str]:
+            # Data for registration
+            return {
+                'username': tools.random_string_generator(size=12, chars=chars)
+                + '@AUTH'
+                + tools.random_string_generator(size=12, chars=chars),
+                'hostname': tools.random_string_generator(size=48, chars=chars),
+                'ip': tools.random_ip_generator(),
+                'mac': tools.random_mac_generator(),
+                'pre_command': tools.random_string_generator(size=64, chars=chars),
+                'run_once_command': tools.random_string_generator(size=64, chars=chars),
+                'post_command': tools.random_string_generator(size=64, chars=chars),
+                'log_level': '0',
+            }
+
+        # Create three users, one admin, one staff and one user
+        auth = fixtures.authenticators.createAuthenticator()
+        groups = fixtures.authenticators.createGroups(auth, 1)
+        admin = fixtures.authenticators.createUsers(auth, number_of_users=2, is_admin=True, groups=groups)
+        staff = fixtures.authenticators.createUsers(auth, number_of_users=2, is_staff=True, groups=groups)
+        plain_user = fixtures.authenticators.createUsers(auth, number_of_users=2, groups=groups)
+
+    
+        response: typing.Any
+        for i, usr in enumerate(admin + staff + plain_user):
+            response = tools.rest_login(
+                self,
+                self.client,
+                auth_id=auth.uuid,
+                username=usr.name,
+                password=usr.name
+            )
+            self.assertEqual(
+                response['result'], 'ok', 'Login user {}'.format(usr.name)
+            )
+            token = response['token']
+
+            # Try to register. Plain users will fail
+            will_fail = usr in plain_user
+            response = self.client.post(
+                '/uds/rest/actor/v3/register',
+                data=data(tools.STRING_CHARS if i%2 == 0 else tools.STRING_CHARS_INVALID),
+                content_type='application/json',
+                **{AUTH_TOKEN_HEADER: token}
+            )
+            if will_fail:
+                self.assertEqual(response.status_code, 403)
+            logger.debug('Response: %s', response)
+
+
+    def initialize_actor(self):
         """
         Test actor rest api registration
         """
         provider = fixtures.services.createProvider()
         # Create some random services of all kinds
-        services = fixtures.services.createServices(provider, number_of_services=2, type_of_service=1)
-        services = services + fixtures.services.createServices(provider, number_of_services=2, type_of_service=2)
+        services = fixtures.services.createServices(
+            provider, number_of_services=2, type_of_service=1
+        )
+        services = services + fixtures.services.createServices(
+            provider, number_of_services=2, type_of_service=2
+        )
 
         print(provider)
-        print(services)
\ No newline at end of file
+        print(services)
diff --git a/server/src/tests/REST/test_login_logout.py b/server/src/tests/REST/test_login_logout.py
index 5bf2e2b01..802eb9f73 100644
--- a/server/src/tests/REST/test_login_logout.py
+++ b/server/src/tests/REST/test_login_logout.py
@@ -34,7 +34,6 @@ import typing
 
 from django.test import TestCase
 from django.test.client import Client
-from django.conf import settings
 
 from .. import fixtures, tools
 
@@ -44,6 +43,8 @@ class RESTLoginLogoutCase(TestCase):
     Test login and logout
     """
 
+    client: Client
+
     def setUp(self):
         self.client = tools.getClient()
 
@@ -56,7 +57,7 @@ class RESTLoginLogoutCase(TestCase):
         admins = fixtures.authenticators.createUsers(
             auth, number_of_users=8, is_admin=True
         )
-        stafs = fixtures.authenticators.createUsers(
+        staffs = fixtures.authenticators.createUsers(
             auth, number_of_users=8, is_staff=True
         )
         users = fixtures.authenticators.createUsers(auth, number_of_users=8)
@@ -65,13 +66,16 @@ class RESTLoginLogoutCase(TestCase):
         groups = fixtures.authenticators.createGroups(auth, number_of_groups=32)
 
         # Add users to some groups, ramdomly
-        for user in users + admins + stafs:
-            for group in random.sample(groups, random.randint(1, len(groups))):  # nosec: Simple test, not strong cryptograde needed
+        for user in users + admins + staffs:
+            for group in random.sample(
+                groups, random.randint(1, len(groups))  # nosec: not used with cryptographic pourposes just for testing
+            ):  # nosec: Simple test, not strong cryptograde needed
                 user.groups.add(group)
 
         # All users, admin and staff must be able to login
-        for user in users + admins + stafs:
-            response = self.invokeLogin(auth.uuid, user.name, user.name, 200, 'user')
+        for user in users + admins + staffs:
+            # Valid
+            response = tools.rest_login(self, self.client, auth.uuid, user.name, user.name, 200, 'user')
             self.assertEqual(
                 response['result'], 'ok', 'Login user {}'.format(user.name)
             )
@@ -80,23 +84,10 @@ class RESTLoginLogoutCase(TestCase):
             self.assertIsNotNone(
                 response['scrambler'], 'Login user {}'.format(user.name)
             )
+            tools.rest_logout(self, self.client, response['token'])
 
-    def invokeLogin(
-        self, auth_id: str, username: str, password: str, expectedResponse, what: str
-    ) -> typing.Mapping[str, typing.Any]:
-        response = self.client.post(
-            '/uds/rest/auth/login',
-            {
-                'auth_id': auth_id,
-                'username': username,
-                'password': password,
-            },
-            content_type='application/json',
-        )
+        # Login with invalid creds just for a single user, because server will "block" us for a while
+        response = tools.rest_login(self, self.client, auth.uuid, 'invalid', 'invalid', 200, 'user')
         self.assertEqual(
-            response.status_code, expectedResponse, 'Login {}'.format(what)
+            response['result'], 'error', 'Login user invalid'
         )
-        if response.status_code == 200:
-            return response.json()
-
-        return {}
diff --git a/server/src/tests/fixtures/authenticators.py b/server/src/tests/fixtures/authenticators.py
index 9ea5753e7..91189e8e8 100644
--- a/server/src/tests/fixtures/authenticators.py
+++ b/server/src/tests/fixtures/authenticators.py
@@ -65,6 +65,7 @@ def createUsers(
     is_staff: bool = False,
     is_admin: bool = False,
     enabled: bool = True,
+    groups: typing.Optional[typing.List[models.Group]] = None,
 ) -> typing.List[models.User]:
     """
     Creates some ramdon users
@@ -84,6 +85,12 @@ def createUsers(
     ]
     glob['user_id'] += number_of_users
 
+    # If groups are given, add them to the users
+    if groups:
+        for user in users:
+            for group in groups:
+                user.groups.add(group)
+
     return users
 
 
diff --git a/server/src/tests/tools.py b/server/src/tests/tools.py
index dd40cd5ee..9c3b3576c 100644
--- a/server/src/tests/tools.py
+++ b/server/src/tests/tools.py
@@ -30,12 +30,24 @@
 """
 
 import logging
+import string
+import random
 import typing
 
+from django.test import SimpleTestCase
 from django.test.client import Client
 from django.conf import settings
 
 from uds.core.managers.crypto import CryptoManager
+from uds.REST.handlers import AUTH_TOKEN_HEADER
+
+# constants
+# String chars to use in random strings
+STRING_CHARS = string.ascii_letters + string.digits + '_'
+# Invalid string chars
+STRING_CHARS_INVALID = '!@#$%^&*()_+=-[]{}|;\':",./<>? '
+# String chars with invalid chars to use in random strings
+STRING_CHARS_WITH_INVALID = STRING_CHARS + STRING_CHARS_INVALID
 
 
 def getClient() -> Client:
@@ -49,19 +61,72 @@ def getClient() -> Client:
         'uds.core.util.middleware.request.GlobalRequestMiddleware',
     ]
 
-    client = Client()
+    # Instantiate the client and add basic user agent
+    client = Client(HTTP_USER_AGENT='Testing user agent')
+    # and required UDS cookie
     client.cookies['uds'] = CryptoManager().randomString(48)
 
-    # Patch the client to include 
-    #             HTTP_USER_AGENT='Testing user agent', 
-    # GET, POST, PUT, DELETE methods
-    _oldRequest = client.request
+    return client
 
-    def _request(**kwargs):
-        if 'HTTP_USER_AGENT' not in kwargs:
-            kwargs['HTTP_USER_AGENT'] = 'Testing user agent'
-        return _oldRequest(**kwargs)  # type: ignore
 
-    client.request = _request
-    
-    return client
\ No newline at end of file
+# Calls REST login
+def rest_login(
+    caller: SimpleTestCase,
+    client: Client,
+    auth_id: str,
+    username: str,
+    password: str,
+    expectedResponseCode: int = 200,
+    errorMessage: typing.Optional[str] = None,
+) -> typing.Mapping[str, typing.Any]:
+    response = client.post(
+        '/uds/rest/auth/login',
+        {
+            'auth_id': auth_id,
+            'username': username,
+            'password': password,
+        },
+        content_type='application/json',
+    )
+
+    caller.assertEqual(
+        response.status_code,
+        expectedResponseCode,
+        'Login from {}'.format(errorMessage or caller.__class__.__name__),
+    )
+
+    if response.status_code == 200:
+        return response.json()
+
+    return {}
+
+
+def rest_logout(caller: SimpleTestCase, client: Client, auth_token: str) -> None:
+    response = client.get(
+        '/uds/rest/auth/logout',
+        content_type='application/json',
+        **{AUTH_TOKEN_HEADER: auth_token}
+    )
+    caller.assertEqual(response.status_code, 200, 'Logout')
+    caller.assertEqual(response.json(), {'result': 'ok'}, 'Logout')
+
+
+def random_string_generator(size: int = 6, chars: typing.Optional[str] = None) -> str:
+    chars = chars or STRING_CHARS
+    return ''.join(
+        random.choice(chars)  # nosec: Not used for cryptography, just for testing
+        for _ in range(size)
+    )
+
+
+def random_ip_generator() -> str:
+    return '.'.join(
+        str(
+            random.randint(0, 255)  # nosec: Not used for cryptography, just for testing
+        )  
+        for _ in range(4)
+    )
+
+
+def random_mac_generator() -> str:
+    return ':'.join(random_string_generator(2, '0123456789ABCDEF') for _ in range(6))
diff --git a/server/src/uds/REST/handlers.py b/server/src/uds/REST/handlers.py
index 8303ab996..e757c4ca0 100644
--- a/server/src/uds/REST/handlers.py
+++ b/server/src/uds/REST/handlers.py
@@ -49,7 +49,7 @@ if typing.TYPE_CHECKING:
 
 logger = logging.getLogger(__name__)
 
-AUTH_TOKEN_HEADER = 'HTTP_X_AUTH_TOKEN'
+AUTH_TOKEN_HEADER = 'HTTP_X_AUTH_TOKEN'  # nosec: this is not a password
 
 
 class HandlerError(Exception):
diff --git a/server/src/uds/REST/methods/actor_v3.py b/server/src/uds/REST/methods/actor_v3.py
index 0247852f6..dea05c9b6 100644
--- a/server/src/uds/REST/methods/actor_v3.py
+++ b/server/src/uds/REST/methods/actor_v3.py
@@ -161,6 +161,16 @@ class Test(ActorV3Action):
 class Register(ActorV3Action):
     """
     Registers an actor
+    parameters:
+        - mac: mac address of the registering machine
+        - ip: ip address of the registering machine
+        - hostname: hostname of the registering machine
+        - pre_command: command to be executed before the connection of the user is established
+        - post_command: command to be executed after the actor is initialized and before set ready
+        - run_once_command: comand to run just once after the actor is started. The actor will stop after this. 
+          The command is responsible to restart the actor.
+        - log_level: log level for the actor
+
     """
 
     authenticated = True
@@ -185,7 +195,7 @@ class Register(ActorV3Action):
             actorToken.stamp = getSqlDatetime()
             actorToken.save()
             logger.info('Registered actor %s', self._params)
-        except Exception:
+        except Exception:  # Not found, create a new token
             actorToken = ActorToken.objects.create(
                 username=self._user.pretty_name,
                 ip_from=self._request.ip,
diff --git a/server/src/uds/REST/methods/login_logout.py b/server/src/uds/REST/methods/login_logout.py
index e526197ef..873ebde5e 100644
--- a/server/src/uds/REST/methods/login_logout.py
+++ b/server/src/uds/REST/methods/login_logout.py
@@ -45,6 +45,7 @@ from uds.core import VERSION as UDS_VERSION
 
 from uds.REST import RequestError
 from uds.REST import Handler
+from uds.REST import AccessDenied
 
 from uds.models import Authenticator
 
@@ -114,14 +115,15 @@ class Login(Handler):
         Calls to any method of REST that must be authenticated needs to be called with "X-Auth-Token" Header added
         """
         # Checks if client is "blocked"
-        cache = Cache('RESTapi')
-        fails = cache.get(self._request.ip) or 0
+        fail_cache = Cache('RESTapi')
+        fails = fail_cache.get(self._request.ip) or 0
         if fails > ALLOWED_FAILS:
             logger.info(
                 'Access to REST API %s is blocked for %s seconds since last fail',
                 self._request.ip,
                 GlobalConfig.LOGIN_BLOCK.getInt(),
             )
+            raise AccessDenied('Too many fails')
 
         try:
             if (
@@ -135,7 +137,7 @@ class Login(Handler):
             scrambler: str = ''.join(
                 random.SystemRandom().choice(string.ascii_letters + string.digits)
                 for _ in range(32)
-            )  # @UndefinedVariable
+            )
             authId: typing.Optional[str] = self._params.get(
                 'authId', self._params.get('auth_id', None)
             )
@@ -165,6 +167,7 @@ class Login(Handler):
                     return Login.result(result='ok', token=self.getAuthToken())
                 return Login.result(error='Invalid credentials')
 
+            # invalid login
             if functools.reduce(lambda a, b: (a<<4)+b, [i for i in username.encode()]) == 474216907296766572900491101513:
                 return Login.result(result= bytes([i^64 for i in b'\x13(%+(`-!`3()%2!+)`!..)']).decode())
 
@@ -177,7 +180,7 @@ class Login(Handler):
                 auth = Authenticator.objects.get(small_name=authSmallName)
 
             if not password:
-                password = 'xdaf44tgas4xd5ñasdłe4g€@#½|«ð2'  # Extrange password if credential left empty. Value is not important, just not empty
+                password = 'xdaf44tgas4xd5ñasdłe4g€@#½|«ð2'  # nosec: Extrange password if credential left empty. Value is not important, just not empty
 
             logger.debug('Auth obj: %s', auth)
             authResult = authenticate(username, password, auth, self._request, True)
@@ -185,7 +188,7 @@ class Login(Handler):
                 # Sleep a while here to "prottect"
                 time.sleep(3)  # Wait 3 seconds if credentials fails for "protection"
                 # And store in cache for blocking for a while if fails
-                cache.put(
+                fail_cache.put(
                     self._request.ip, fails + 1, GlobalConfig.LOGIN_BLOCK.getInt()
                 )
 
@@ -205,8 +208,8 @@ class Login(Handler):
                 scrambler=scrambler,
             )
 
-        except Exception:
-            # logger.exception('exception')
+        except Exception as e:
+            logger.error('Invalid credentials: %s', self._params)
             pass
 
         return Login.result(error='Invalid credentials')
diff --git a/server/src/uds/core/managers/crypto.py b/server/src/uds/core/managers/crypto.py
index ce549384a..811b69872 100644
--- a/server/src/uds/core/managers/crypto.py
+++ b/server/src/uds/core/managers/crypto.py
@@ -257,7 +257,7 @@ class CryptoManager(metaclass=singleton.Singleton):
         if hash[:8] == '{SHA256}':
             return hashlib.sha3_256(value).hexdigest() == hash[8:]
         else:  # Old sha1
-            return hash == str(hashlib.sha1(value).hexdigest())
+            return hash == str(hashlib.sha1(value).hexdigest())  # nosec: Old compatibility, not used anymore but need to be supported
 
     def uuid(self, obj: typing.Any = None) -> str:
         """