This is a question of setting up the network interface correctly, in your WiFi router or in your set-top box system.
It depends on what is used as the main gateway for internet access. It depends on the direction of network communication ... from the plugin (from your Linux set-top box), through various connection nodes, then via the internet and then it ends up in the picon server.
However, the picon server does not allow proxy and VPN connections (through VPN gateways). These connections are often abused, for example as for DDoS. Unfortunately... reporting of these VPN accounts is also a lengthy process (in terms of jurisdiction).
The solution would be to set up your Linux set-top box so that according to the network communication policy, the connection to the picon.cz server was routed only through your internet gateway (your internet provider directly) and not through the VPN network.
