diff --git a/freqtrade/constants.py b/freqtrade/constants.py
index e77940b3c..2cc2fd115 100644
--- a/freqtrade/constants.py
+++ b/freqtrade/constants.py
@@ -502,12 +502,13 @@ CONF_SCHEMA = {
                         'required': ['name', 'url', 'ws_token']
                     }
                 },
-                'wait_timeout': {'type': 'integer'},
-                'sleep_time': {'type': 'integer'},
-                'ping_timeout': {'type': 'integer'},
+                'wait_timeout': {'type': 'integer', 'minimum': 0},
+                'sleep_time': {'type': 'integer', 'minimum': 0},
+                'ping_timeout': {'type': 'integer', 'minimum': 0},
                 'remove_signals_analyzed_df': {'type': 'boolean', 'default': False},
                 'initial_candle_limit': {
                     'type': 'integer',
+                    'minimum': 0,
                     'maximum': 1500,
                     'default': 1500
                 }
diff --git a/freqtrade/rpc/api_server/api_auth.py b/freqtrade/rpc/api_server/api_auth.py
index 93be251ab..1ab158ea7 100644
--- a/freqtrade/rpc/api_server/api_auth.py
+++ b/freqtrade/rpc/api_server/api_auth.py
@@ -56,7 +56,7 @@ async def validate_ws_token(
     ws_token: Union[str, None] = Query(default=None, alias="token"),
     api_config: Dict[str, Any] = Depends(get_api_config)
 ):
-    secret_ws_token = api_config.get('ws_token', 'secret_ws_t0ken.')
+    secret_ws_token = api_config.get('ws_token', None)
     secret_jwt_key = api_config.get('jwt_secret_key', 'super-secret')
 
     if ws_token and secrets.compare_digest(secret_ws_token, ws_token):