How to block Viber on the local network?

Question

Computer networks

You need to block the Viber application on all computers in the local network. Kerio is used as a firewall. The Viber application communicates with servers through TCP port 443. You can't block it, of course.
Options?

Answer 1

in kerio: create a traffic rule > general (prohibit)
source: interfaces-all trusted interfaces
destination: all domain names and viber addresses that
the service finds: any
ready, apply

Answer 2

It is possible to block the executable file (both by name and by checksum) by group / local policies.

Answer 3

If you had a Mikrotik, which is somewhat smarter in this regard, then everything would be solved many times easier
, try to look for the following fields in Kerio, and remove the tariff with a wireshark to see which of the fields the viber uses and what they say
Connection Type
Application type something like this

Answer 4

In the same kerio, look at which servers viber is knocking on and create an appropriate rule.

Answer 5

The port can and cannot be blocked, and access to its servers is quite at least op a domain name, at least by ip.