diff -r 30493ff3a23a -r 4bc60e426dd6 modbus/web_settings.py
--- a/modbus/web_settings.py	Fri Jun 12 14:40:50 2020 +0200
+++ b/modbus/web_settings.py	Mon Jun 15 14:27:58 2020 +0200
@@ -488,7 +488,7 @@
     def __OnButtonSave(**kwargs):
         OnButtonSave(WebNode_id=WebNode_id, **kwargs)
 
-    WebSettings = NS.newExtensionSetting("Modbus "+config_hash)
+    WebSettings = NS.newExtensionSetting("Modbus #"+ str(WebNode_id), config_hash)
 
     WebSettings.addSettings(
         "ModbusConfigParm"          + config_hash,     # name (internal, may not contain spaces, ...)
@@ -605,10 +605,10 @@
     
     # Delete the Modbus specific web interface extensions
     # (Safe to ask to delete, even if it has not been added!)
-    global _WebNodeList    
-    for WebNode_entry in _WebNodeList:
+    global _WebNodeList
+    for index, WebNode_entry in enumerate(_WebNodeList):
         config_hash = WebNode_entry["config_hash"]
-        NS.removeExtensionSetting("Modbus "+config_hash)
+        NS.removeExtensionSetting(config_hash)
         
     # Dele all entries...
     _WebNodeList = []