Improve connection status determination logic

core/controllers/ConnectionController.py

@@ -402,16 +402,32 @@ class ConnectionController:
     @staticmethod
     def __test_connection(port_number: Optional[int] = None, timeout: float = 10.0):
 
-        timeout = float(timeout)
         proxies = None
+        request_urls = [Constants.PING_URL]
+        timeout = float(timeout)
 
         if port_number is not None:
             proxies = ConnectionController.get_proxies(port_number)
 
-        try:
-            requests.get(Constants.PING_URL, timeout=timeout, proxies=proxies)
-        except requests.exceptions.RequestException:
-            raise ConnectionError('The connection could not be established.')
+        if os.environ.get('PING_URL') is None:
+
+            request_urls.extend([
+                'https://hc1.simplifiedprivacy.net',
+                'https://hc2.simplifiedprivacy.org',
+                'https://hc3.hydraveil.net'
+            ])
+
+        for request_url in request_urls:
+
+            try:
+
+                requests.get(request_url, timeout=timeout, proxies=proxies)
+                return None
+
+            except requests.exceptions.RequestException:
+                pass
+
+        raise ConnectionError('The connection could not be established.')
 
     @staticmethod
     def __should_renegotiate(profile: Union[SessionProfile, SystemProfile]):