Cerca:

<?php
error_reporting(E_ALL);

ini_set("display_errors", 1);

$botToken = "172894271:AAHsyo*******************GRN8Y";
$botUrl = "https://api.telegram.org/bot" . $botToken;

$ch = curl_init();

L'errore in question e' "Curl error: Received HTTP code 403 from proxy after CONNECT"
come posso risolvere? Abilitando le connsioni Server2Server, in tal caso come si fa?

Grazie.