diff --git a/Furious/Qt/NetworkConnectivityManager.py b/Furious/Qt/NetworkConnectivityManager.py
index 506b5cb..1c10594 100644
--- a/Furious/Qt/NetworkConnectivityManager.py
+++ b/Furious/Qt/NetworkConnectivityManager.py
@@ -76,10 +76,10 @@ class NetworkConnectivityManager(Mixins.ConnectionAware, WebGETManager):
         # Use custom network connectivity test URL if possible
         settings = AppSettings.get('CustomNetworkConnectivityTestURL')
 
-        if settings is None:
-            url = NETWORK_CONNECTIVITY_TEST_URL
-        else:
+        if isinstance(settings, str):
             url = settings
+        else:
+            url = NETWORK_CONNECTIVITY_TEST_URL
 
         networkReply = self.webGET(url)
 
diff --git a/Furious/TrayActions/Connect.py b/Furious/TrayActions/Connect.py
index e87a1cb..3d177db 100644
--- a/Furious/TrayActions/Connect.py
+++ b/Furious/TrayActions/Connect.py
@@ -256,10 +256,10 @@ class ConnectAction(AppQAction):
                     # Use custom proxy bypass address if possible
                     settings = AppSettings.get('CustomProxyBypass')
 
-                    if settings is None:
-                        proxyServerBypass = PROXY_SERVER_BYPASS
-                    else:
+                    if isinstance(settings, str):
                         proxyServerBypass = settings
+                    else:
+                        proxyServerBypass = PROXY_SERVER_BYPASS
 
                     try:
                         SystemProxy.set(httpProxy, proxyServerBypass)
diff --git a/Furious/Widget/GuiCustomizeNetworkTest.py b/Furious/Widget/GuiCustomizeNetworkTest.py
index 226b3e5..f1f1371 100644
--- a/Furious/Widget/GuiCustomizeNetworkTest.py
+++ b/Furious/Widget/GuiCustomizeNetworkTest.py
@@ -47,20 +47,20 @@ class GuiCustomizeNetworkTestDialog(AppQDialog):
 
         speedTestURLSettings = AppSettings.get('CustomNetworkSpeedTestURL')
 
-        if speedTestURLSettings is None:
-            self.speedTestURLEdit.setText(NETWORK_SPEED_TEST_URL)
-        else:
+        if isinstance(speedTestURLSettings, str):
             self.speedTestURLEdit.setText(speedTestURLSettings)
+        else:
+            self.speedTestURLEdit.setText(NETWORK_SPEED_TEST_URL)
 
         self.connectivityText = AppQLabel(_('Enter network connectivity test URL:'))
         self.connectivityEdit = QLineEdit()
 
         connectivitySettings = AppSettings.get('CustomNetworkConnectivityTestURL')
 
-        if connectivitySettings is None:
-            self.connectivityEdit.setText(NETWORK_CONNECTIVITY_TEST_URL)
-        else:
+        if isinstance(connectivitySettings, str):
             self.connectivityEdit.setText(connectivitySettings)
+        else:
+            self.connectivityEdit.setText(NETWORK_CONNECTIVITY_TEST_URL)
 
         self.dialogBtns = AppQDialogButtonBox(QtCore.Qt.Orientation.Horizontal)
         self.dialogBtns.addButton(_('OK'), AppQDialogButtonBox.ButtonRole.AcceptRole)
@@ -127,8 +127,8 @@ class GuiCustomizeNetworkTestDialog(AppQDialog):
                 try:
                     settings = AppSettings.get(settingsName)
 
-                    if settings is not None:
-                        widget.setText(str(settings))
+                    if isinstance(settings, str):
+                        widget.setText(settings)
                     else:
                         widget.setText(reset)
                 except Exception as ex:
diff --git a/Furious/Widget/GuiCustomizeProxyBypass.py b/Furious/Widget/GuiCustomizeProxyBypass.py
index 6251939..2e0d23b 100644
--- a/Furious/Widget/GuiCustomizeProxyBypass.py
+++ b/Furious/Widget/GuiCustomizeProxyBypass.py
@@ -48,10 +48,10 @@ class GuiCustomizeProxyBypassDialog(AppQDialog):
 
         settings = AppSettings.get('CustomProxyBypass')
 
-        if settings is None:
-            self.proxyBypassEdit.setText(PROXY_SERVER_BYPASS)
-        else:
+        if isinstance(settings, str):
             self.proxyBypassEdit.setText(settings)
+        else:
+            self.proxyBypassEdit.setText(PROXY_SERVER_BYPASS)
 
         self.dialogBtns = AppQDialogButtonBox(QtCore.Qt.Orientation.Horizontal)
         self.dialogBtns.addButton(_('OK'), AppQDialogButtonBox.ButtonRole.AcceptRole)
@@ -83,13 +83,24 @@ class GuiCustomizeProxyBypassDialog(AppQDialog):
 
     def handleResultCode(self, code):
         if code == PySide6Legacy.enumValueWrapper(AppQDialog.DialogCode.Accepted):
-            value = self.proxyBypassEdit.text()
+            oldValue = AppSettings.get('CustomProxyBypass')
+            newValue = self.proxyBypassEdit.text()
 
-            logger.info(f'setting custom proxy bypass address to \'{value}\'')
+            def writeNewSettings(value):
+                logger.info(f'setting custom proxy bypass address to \'{value}\'')
 
-            AppSettings.set('CustomProxyBypass', value)
+                AppSettings.set('CustomProxyBypass', value)
 
-            showMBoxNewChangesNextTime()
+                showMBoxNewChangesNextTime()
+
+            if not isinstance(oldValue, str):
+                if newValue == PROXY_SERVER_BYPASS:
+                    return
+                else:
+                    writeNewSettings(newValue)
+            else:
+                if oldValue != newValue:
+                    writeNewSettings(newValue)
         else:
             try:
                 settings = AppSettings.get('CustomProxyBypass')
@@ -103,5 +114,6 @@ class GuiCustomizeProxyBypassDialog(AppQDialog):
 
                 logger.error(f'error restoring proxy bypass address: {ex}')
 
+    @QtCore.Slot()
     def handleResetButtonClicked(self):
         self.proxyBypassEdit.setText(PROXY_SERVER_BYPASS)
diff --git a/Furious/Widget/UserServersQTableWidget.py b/Furious/Widget/UserServersQTableWidget.py
index 71f190c..d49616d 100644
--- a/Furious/Widget/UserServersQTableWidget.py
+++ b/Furious/Widget/UserServersQTableWidget.py
@@ -599,10 +599,10 @@ class TestDownloadSpeedWorker(WebGETManager):
                     # Use custom network speed test URL if possible
                     settings = AppSettings.get('CustomNetworkSpeedTestURL')
 
-                    if settings is None:
-                        url = NETWORK_SPEED_TEST_URL
-                    else:
+                    if isinstance(settings, str):
                         url = settings
+                    else:
+                        url = NETWORK_SPEED_TEST_URL
 
                     self.networkReply = self.webGET(url, **self.kwargs)