Antivirus stopped updating

I have a ReadyNAS RN212, The firmware version is 6.10.4, the antivirus has stopped updating, the last update was March 31, 2021 the error message reads ‘System: Antivirus scanner definition file update failed due to download failure. Check your Internet connection’. I have tryed restarting the NAS with no change, is there something I can do to restart the antivirus automatically updating again.

I think the NAS as access to the internet, I can download apps, but how can I check the internet is working correctly on the ReadyNAS