Allowing the WhatsApp application in Guardian and via the Firewall.
The WhatsApp application does not work through a transparent proxy.
The WhatsApp application sends non-SSL data over SSL port
443. This causes the SSL handshake to fail between the server and the Smoothwall. In WhatsApp's case, the destination server does not return any error but just closes the "Client Hello" (sent as a part of SSL handshake). As a result the Smoothwall is unable to tunnel this transaction.
You will need to open outgoing ports on your firewall, as well as adding Guardian destination exceptions:
- Open the following ports (both TCP and UDP) on your firewall for outgoing traffic:
(updated server list 17-Dec-2015)
(updated URL list 24-Oct-2016)