If you export a Sophos firewall .conf file and attempt to import and merge it into an existing configuration it may produces an error message, for example:
A duplicate entry was attempted to be added to UniqueUnorderedList
This issue is usually only seen if you try to merge a configuration more than once.
What to do
When you import the.conf file you must overwrite the existing one rather than merge it.
- On the General Tab, select the Import button.
- Select what you want to Import.
- From the options displayed, select the option to overwrite the current configuration.
This is a known issue, it arises from the way in which the Sophos firewall renames rules.