Hello, I think you need a real domain or sub domain point to the Public IP of your server. regards --- I'm SoCIaL, MayBe On 8/12/18 15:37, Amar Tinawi wrote: Hello i'm wondering if i can generate tls certificate for kamailio using letsencrypt with test domain name, in testing enviroment following this post : https://www.fredposner.com/1836/kamailio-tls-and-letsencrypt/ got an error by letsecrypt because of checking of the domain name authority and no certificate was generated. Regards _______________________________________________ Kamailio (SER) - Users Mailing Listsr-users@lists.kamailio.orghttps://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users _______________________________________________ Kamailio (SER) - Users Mailing List sr-users(a)lists.kamailio.org https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users