Connection blocking with Sierra 10.12.5 and Security 7.4.1

After LiveUpdate upgraded this morning to Norton Security for Mac 7.4.1 (previous version 7.4.0), I can no longer connect to the internet on my Mac.

Even LiveUpdate starts to download updates and never finishes doing so. 

I have tried disabling Automatic scans and Application Blocking, but I get the same results: cannot connect neither to the internet nor to any computer in my local network.

Idle scans are also disabled, with version 7.4.0 I had this same exact problem, which was solved when disabling Idle scans.