Hi Thanh, Are you intending to use Client certificates in your setup? If not, the error “SSL3_GET_CLIENT_CERTIFICATE “ would lead me to believe that your problem is modparam("tls", "require_certificate", 1) which when enabled kamailio will require a certificate from the client. I’m not an expert with TLS, but this may help depending on what type of TLS setup you are trying to achieve. *From:* sr-users [mailto:sr-users-bounces@lists.sip-router.org] *On Behalf Of *Thanh Truong *Sent:* 18 December 2014 15:28 *To:* kamailio *Subject:* [SR-Users] TLS enable false. Hi all, I have tried several configure TLS in kamailio but no luck. Please give me some suggestion that I can make it work correctly. This is my configure in TLS module. modparam("tls", "tls_method", "SSLv23") modparam("tls", "private_key", "/usr/local/etc/kamailio/ca/privkey.pem") modparam("tls", "certificate", "/usr/local/etc/kamailio/ca/kamailio1_cert.pem") modparam("tls", "ca_list", "/usr/local/etc/kamailio/ca/calist.pem") modparam("tls", "verify_certificate", 1) modparam("tls", "require_certificate", 1) I am only getting issue with verify_certifiate = 1, it i let it to 0, my client can register correctly. When I set this flag, i got message from server as: Dec 18 10:26:31 17237 /usr/local/sbin/kamailio[12655]: ERROR: <core> [tcp_read.c:1279]: tcp_read_req(): ERROR: tcp_read_req: error reading Dec 18 10:26:46 17237 /usr/local/sbin/kamailio[12656]: ERROR: tls [tls_server.c:1193]: tls_read_f(): TLS accept:error:140890C7:SSL routines:SSL3_GET_CLIENT_CERTIFICATE:peer did not return a certificate Dec 18 10:26:46 17237 /usr/local/sbin/kamailio[12656]: ERROR: <core> [tcp_read.c:1279]: tcp_read_req(): ERROR: tcp_read_req: error reading I Cant add any pem file into client, i have used Blink phone but no luck. Thank all in advance. ThanhTruong. _______________________________________________ SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list sr-users(a)lists.sip-router.org http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users