Hi, I have the same problem. I am in the UK, I have CCleaner Professional (Premium) so it is running on 2 desktops and 3 laptops, laptops on Windows 11 and desktops on Windows 10. Everything is up to date, windows, software, drivers etc. All devices have this issue where the Security part of Health Check and Software Updater part of Tools do not work. Security says "Unable to reach server" and Software Updater says "It seems like you're offline". I use Sophos Home anti virus and can not see an option to allow the CCleaner app and all apps should be allowed. If there is a specific file I can exclude it from the scan but I can't see that being the issue.