Hello,

I'm using Kamailio v. 5.1.0-21 on CentOs 6 machine, installed from repository. It is running behind the NAT. I'm using Htek and Zoiper phones for testing. Below is content from my tls.cfg configuration file: ``` [server:default] method = TLSv1.2 method = SSLv23 require_certificate = yes verify_certificate = yes private_key = /var/kamailio/certificates/default/server/key.pem certificate = /var/kamailio/certificates/default/server/cert.pem ca_list = /var/kamailio/certificates/default/CA/cert.pem

[server:172.16.30.205:5061] method = SSLv23 require_certificate = yes verify_certificate = yes private_key = /var/kamailio/certificates/first.my-domain.com/server/key.pem certificate = /var/kamailio/certificates/first.my-domain.com/server/cert.pem ca_list = /var/kamailio/certificates/first.my-domain.com/CA/cert.pem server_name = "first.my-domain.com"

[server:172.16.30.205:5061] method = SSLv23 require_certificate = yes verify_certificate = yes private_key = /var/kamailio/certificates/second.my-domain.com/server/key.pem certificate = /var/kamailio/certificates/second.my-domain.com/server/cert.pem ca_list = /var/kamailio/certificates/second.my-domain.com/CA/cert.pem server_name = "second.my-domain.com"

[client:default] verify_certificate = yes require_certificate = yes ```

My **first** phone is configured with certificate for _first.my-domain.com_ and **second** - for _second.my-domain.com_.

When I try to connect with **first** phone, it fails. I get following output in Kamailio log file: ``` Jun 25 15:36:50 kamailio-dev /usr/sbin/kamailio[8180]: DEBUG: <core> [core/ip_addr.c:229]: print_ip(): tcpconn_new: new tcp connection: office_with_phones_public_ip_address Jun 25 15:36:50 kamailio-dev /usr/sbin/kamailio[8180]: DEBUG: <core> [core/tcp_main.c:999]: tcpconn_new(): on port 5360, type 3 Jun 25 15:36:50 kamailio-dev /usr/sbin/kamailio[8180]: DEBUG: <core> [core/tcp_main.c:1309]: tcpconn_add(): hashes: 480:2863:2253, 1 Jun 25 15:36:50 kamailio-dev /usr/sbin/kamailio[8180]: DEBUG: <core> [core/io_wait.h:380]: io_watch_add(): DBG: io_watch_add(0xa4ea20, 55, 2, 0x7f605f124d10), fd_no=42 Jun 25 15:36:50 kamailio-dev /usr/sbin/kamailio[8180]: DEBUG: <core> [core/io_wait.h:602]: io_watch_del(): DBG: io_watch_del (0xa4ea20, 55, -1, 0x0) fd_no=43 called Jun 25 15:36:50 kamailio-dev /usr/sbin/kamailio[8180]: DEBUG: <core> [core/tcp_main.c:4196]: handle_tcpconn_ev(): sending to child, events 1 Jun 25 15:36:50 kamailio-dev /usr/sbin/kamailio[8180]: DEBUG: <core> [core/tcp_main.c:3878]: send2child(): selected tcp worker 0 31(8168) for activity on [tls:172.16.30.205:5061], 0x7f605f124d10 Jun 25 15:36:50 kamailio-dev /usr/sbin/kamailio[8168]: DEBUG: <core> [core/tcp_read.c:1740]: handle_io(): received n=8 con=0x7f605f124d10, fd=12 Jun 25 15:36:50 kamailio-dev /usr/sbin/kamailio[8168]: DEBUG: tls [tls_server.c:199]: tls_complete_init(): completing tls connection initialization Jun 25 15:36:50 kamailio-dev /usr/sbin/kamailio[8168]: DEBUG: tls [tls_server.c:228]: tls_complete_init(): Using initial TLS domain TLSs<172.16.30.205:5061> (dom 0x7f605eaa7f38 ctx 0x7f605ed545b0 sn [second.my-domain.com]) Jun 25 15:36:50 kamailio-dev /usr/sbin/kamailio[8168]: DEBUG: tls [tls_domain.c:724]: sr_ssl_ctx_info_callback(): SSL handshake started Jun 25 15:36:50 kamailio-dev /usr/sbin/kamailio[8168]: DEBUG: tls [tls_domain.c:927]: tls_server_name_cb(): SSL_get_servername returned NULL: return SSL_TLSEXT_ERR_NOACK Jun 25 15:36:50 kamailio-dev /usr/sbin/kamailio[8168]: DEBUG: <core> [core/tcp_main.c:2460]: tcpconn_do_send(): sending... Jun 25 15:36:50 kamailio-dev /usr/sbin/kamailio[8168]: DEBUG: <core> [core/tcp_main.c:2494]: tcpconn_do_send(): after real write: c= 0x7f605f124d10 n=2401 fd=12 Jun 25 15:36:50 kamailio-dev /usr/sbin/kamailio[8168]: DEBUG: <core> [core/tcp_main.c:2495]: tcpconn_do_send(): buf= Jun 25 15:36:50 kamailio-dev /usr/sbin/kamailio[8168]: DEBUG: <core> [core/io_wait.h:380]: io_watch_add(): DBG: io_watch_add(0xa92cc0, 12, 2, 0x7f605f124d10), fd_no=1 Jun 25 15:36:51 kamailio-dev /usr/sbin/kamailio[8168]: DEBUG: <core> [core/tcp_main.c:2460]: tcpconn_do_send(): sending... Jun 25 15:36:51 kamailio-dev /usr/sbin/kamailio[8168]: DEBUG: <core> [core/tcp_main.c:2494]: tcpconn_do_send(): after real write: c= 0x7f605f124d10 n=7 fd=12 Jun 25 15:36:51 kamailio-dev /usr/sbin/kamailio[8168]: DEBUG: <core> [core/tcp_main.c:2495]: tcpconn_do_send(): buf= Jun 25 15:36:51 kamailio-dev /usr/sbin/kamailio[8168]: ERROR: tls [tls_util.h:42]: tls_err_ret(): TLS accept:error:140890B2:SSL routines:SSL3_GET_CLIENT_CERTIFICATE:no certificate returned Jun 25 15:36:51 kamailio-dev /usr/sbin/kamailio[8168]: ERROR: <core> [core/tcp_read.c:1485]: tcp_read_req(): ERROR: tcp_read_req: error reading - c: 0x7f605f124d10 r: 0x7f605f124d90 Jun 25 15:36:51 kamailio-dev /usr/sbin/kamailio[8168]: DEBUG: <core> [core/io_wait.h:602]: io_watch_del(): DBG: io_watch_del (0xa92cc0, 12, -1, 0x10) fd_no=2 called Jun 25 15:36:51 kamailio-dev /usr/sbin/kamailio[8168]: DEBUG: <core> [core/tcp_read.c:1664]: release_tcpconn(): releasing con 0x7f605f124d10, state -2, fd=12, id=1 ([office_with_phones_public_ip_address]:5360 -> [office_with_phones_public_ip_address]:5061) Jun 25 15:36:51 kamailio-dev /usr/sbin/kamailio[8168]: DEBUG: <core> [core/tcp_read.c:1665]: release_tcpconn(): extra_data 0x7f605f0bb8f8 Jun 25 15:36:51 kamailio-dev /usr/sbin/kamailio[8180]: DEBUG: <core> [core/tcp_main.c:3308]: handle_tcp_child(): reader response= 7f605f124d10, -2 from 0 Jun 25 15:36:51 kamailio-dev /usr/sbin/kamailio[8180]: DEBUG: tls [tls_server.c:667]: tls_h_close(): Closing SSL connection 0x7f605f0bb8f8 ```

However **second** phone connects with no problems: ``` Jun 25 15:40:41 kamailio-dev /usr/sbin/kamailio[9155]: DEBUG: <core> [core/ip_addr.c:229]: print_ip(): tcpconn_new: new tcp connection: office_with_phones_public_ip_address Jun 25 15:40:41 kamailio-dev /usr/sbin/kamailio[9155]: DEBUG: <core> [core/tcp_main.c:999]: tcpconn_new(): on port 53732, type 3 Jun 25 15:40:41 kamailio-dev /usr/sbin/kamailio[9155]: DEBUG: <core> [core/tcp_main.c:1309]: tcpconn_add(): hashes: 1406:4017:3155, 1 Jun 25 15:40:41 kamailio-dev /usr/sbin/kamailio[9155]: DEBUG: <core> [core/io_wait.h:380]: io_watch_add(): DBG: io_watch_add(0xa4ea20, 55, 2, 0x7fa084d00d10), fd_no=42 Jun 25 15:40:41 kamailio-dev /usr/sbin/kamailio[9155]: DEBUG: <core> [core/io_wait.h:602]: io_watch_del(): DBG: io_watch_del (0xa4ea20, 55, -1, 0x0) fd_no=43 called Jun 25 15:40:41 kamailio-dev /usr/sbin/kamailio[9155]: DEBUG: <core> [core/tcp_main.c:4196]: handle_tcpconn_ev(): sending to child, events 1 Jun 25 15:40:41 kamailio-dev /usr/sbin/kamailio[9155]: DEBUG: <core> [core/tcp_main.c:3878]: send2child(): selected tcp worker 0 31(9146) for activity on [tls:172.16.30.205:5061], 0x7fa084d00d10 Jun 25 15:40:41 kamailio-dev /usr/sbin/kamailio[9146]: DEBUG: <core> [core/tcp_read.c:1740]: handle_io(): received n=8 con=0x7fa084d00d10, fd=12 Jun 25 15:40:41 kamailio-dev /usr/sbin/kamailio[9146]: DEBUG: tls [tls_server.c:199]: tls_complete_init(): completing tls connection initialization Jun 25 15:40:41 kamailio-dev /usr/sbin/kamailio[9146]: DEBUG: tls [tls_server.c:228]: tls_complete_init(): Using initial TLS domain TLSs<172.16.30.205:5061> (dom 0x7fa084683f38 ctx 0x7fa0849305b0 sn [second.my-domain.com]) Jun 25 15:40:41 kamailio-dev /usr/sbin/kamailio[9146]: DEBUG: tls [tls_domain.c:724]: sr_ssl_ctx_info_callback(): SSL handshake started Jun 25 15:40:41 kamailio-dev /usr/sbin/kamailio[9146]: DEBUG: tls [tls_domain.c:927]: tls_server_name_cb(): SSL_get_servername returned NULL: return SSL_TLSEXT_ERR_NOACK Jun 25 15:40:41 kamailio-dev /usr/sbin/kamailio[9146]: DEBUG: <core> [core/tcp_main.c:2460]: tcpconn_do_send(): sending... Jun 25 15:40:41 kamailio-dev /usr/sbin/kamailio[9146]: DEBUG: <core> [core/tcp_main.c:2494]: tcpconn_do_send(): after real write: c= 0x7fa084d00d10 n=2406 fd=12 Jun 25 15:40:41 kamailio-dev /usr/sbin/kamailio[9146]: DEBUG: <core> [core/tcp_main.c:2495]: tcpconn_do_send(): buf= Jun 25 15:40:41 kamailio-dev /usr/sbin/kamailio[9146]: DEBUG: <core> [core/io_wait.h:380]: io_watch_add(): DBG: io_watch_add(0xa92cc0, 12, 2, 0x7fa084d00d10), fd_no=1 Jun 25 15:40:41 kamailio-dev /usr/sbin/kamailio[9146]: DEBUG: tls [tls_domain.c:736]: sr_ssl_ctx_info_callback(): SSL handshake done Jun 25 15:40:41 kamailio-dev /usr/sbin/kamailio[9146]: DEBUG: tls [tls_domain.c:740]: sr_ssl_ctx_info_callback(): SSL disable renegotiation Jun 25 15:40:41 kamailio-dev /usr/sbin/kamailio[9146]: DEBUG: tls [tls_server.c:415]: tls_accept(): TLS accept successful Jun 25 15:40:41 kamailio-dev /usr/sbin/kamailio[9146]: DEBUG: tls [tls_server.c:422]: tls_accept(): tls_accept: new connection from office_with_phones_public_ip_address:53732 using TLSv1/SSLv3 AES256-GCM-SHA384 256 Jun 25 15:40:41 kamailio-dev /usr/sbin/kamailio[9146]: DEBUG: tls [tls_server.c:425]: tls_accept(): tls_accept: local socket: 172.16.30.205:5061 Jun 25 15:40:41 kamailio-dev /usr/sbin/kamailio[9146]: DEBUG: tls [tls_server.c:372]: tls_dump_cert_info(): tls_accept: client certificate subject:/C=UA/ST=Lviv/O=Test/OU=Dev/CN=second.my-domain.com/emailAddress=volodya@my-domain.com Jun 25 15:40:41 kamailio-dev /usr/sbin/kamailio[9146]: DEBUG: tls [tls_server.c:376]: tls_dump_cert_info(): tls_accept: client certificate issuer:/C=UA/ST=Lviv/L=Lviv/O=Test/OU=Dev/CN=second.my-domain.com/emailAddress=volodya@my-domain.com ```

After swapping `[server:172.16.30.205:5061]` sections in tls.cfg, **first** phone can connect: ``` Jun 25 15:47:04 kamailio-dev /usr/sbin/kamailio[9852]: DEBUG: <core> [core/ip_addr.c:229]: print_ip(): tcpconn_new: new tcp connection: office_with_phones_public_ip_address Jun 25 15:47:04 kamailio-dev /usr/sbin/kamailio[9852]: DEBUG: <core> [core/tcp_main.c:999]: tcpconn_new(): on port 42055, type 3 Jun 25 15:47:04 kamailio-dev /usr/sbin/kamailio[9852]: DEBUG: <core> [core/tcp_main.c:1309]: tcpconn_add(): hashes: 54:2809:2331, 1 Jun 25 15:47:04 kamailio-dev /usr/sbin/kamailio[9852]: DEBUG: <core> [core/io_wait.h:380]: io_watch_add(): DBG: io_watch_add(0xa4ea20, 55, 2, 0x7f5ce90d2eb0), fd_no=42 Jun 25 15:47:04 kamailio-dev /usr/sbin/kamailio[9852]: DEBUG: <core> [core/io_wait.h:602]: io_watch_del(): DBG: io_watch_del (0xa4ea20, 55, -1, 0x0) fd_no=43 called Jun 25 15:47:04 kamailio-dev /usr/sbin/kamailio[9852]: DEBUG: <core> [core/tcp_main.c:4196]: handle_tcpconn_ev(): sending to child, events 1 Jun 25 15:47:04 kamailio-dev /usr/sbin/kamailio[9852]: DEBUG: <core> [core/tcp_main.c:3878]: send2child(): selected tcp worker 0 31(9842) for activity on [tls:172.16.30.205:5061], 0x7f5ce90d2eb0 Jun 25 15:47:04 kamailio-dev /usr/sbin/kamailio[9842]: DEBUG: <core> [core/tcp_read.c:1740]: handle_io(): received n=8 con=0x7f5ce90d2eb0, fd=12 Jun 25 15:47:04 kamailio-dev /usr/sbin/kamailio[9842]: DEBUG: tls [tls_server.c:199]: tls_complete_init(): completing tls connection initialization Jun 25 15:47:04 kamailio-dev /usr/sbin/kamailio[9842]: DEBUG: tls [tls_server.c:228]: tls_complete_init(): Using initial TLS domain TLSs<172.16.30.205:5061> (dom 0x7f5ce8a55fd8 ctx 0x7f5ce8d025b0 sn [first.my-domain.com]) Jun 25 15:47:04 kamailio-dev /usr/sbin/kamailio[9842]: DEBUG: tls [tls_domain.c:724]: sr_ssl_ctx_info_callback(): SSL handshake started Jun 25 15:47:04 kamailio-dev /usr/sbin/kamailio[9842]: DEBUG: tls [tls_domain.c:927]: tls_server_name_cb(): SSL_get_servername returned NULL: return SSL_TLSEXT_ERR_NOACK Jun 25 15:47:04 kamailio-dev /usr/sbin/kamailio[9842]: DEBUG: <core> [core/tcp_main.c:2460]: tcpconn_do_send(): sending... Jun 25 15:47:04 kamailio-dev /usr/sbin/kamailio[9842]: DEBUG: <core> [core/tcp_main.c:2494]: tcpconn_do_send(): after real write: c= 0x7f5ce90d2eb0 n=2371 fd=12 Jun 25 15:47:04 kamailio-dev /usr/sbin/kamailio[9842]: DEBUG: <core> [core/tcp_main.c:2495]: tcpconn_do_send(): buf= Jun 25 15:47:04 kamailio-dev /usr/sbin/kamailio[9842]: DEBUG: <core> [core/io_wait.h:380]: io_watch_add(): DBG: io_watch_add(0xa92cc0, 12, 2, 0x7f5ce90d2eb0), fd_no=1 Jun 25 15:47:05 kamailio-dev /usr/sbin/kamailio[9842]: DEBUG: tls [tls_domain.c:736]: sr_ssl_ctx_info_callback(): SSL handshake done Jun 25 15:47:05 kamailio-dev /usr/sbin/kamailio[9842]: DEBUG: tls [tls_domain.c:740]: sr_ssl_ctx_info_callback(): SSL disable renegotiation Jun 25 15:47:05 kamailio-dev /usr/sbin/kamailio[9842]: DEBUG: tls [tls_server.c:415]: tls_accept(): TLS accept successful Jun 25 15:47:05 kamailio-dev /usr/sbin/kamailio[9842]: DEBUG: tls [tls_server.c:422]: tls_accept(): tls_accept: new connection from office_with_phones_public_ip_address:42055 using TLSv1/SSLv3 AES128-SHA 128 Jun 25 15:47:05 kamailio-dev /usr/sbin/kamailio[9842]: DEBUG: tls [tls_server.c:425]: tls_accept(): tls_accept: local socket: 172.16.30.205:5061 Jun 25 15:47:05 kamailio-dev /usr/sbin/kamailio[9842]: DEBUG: tls [tls_server.c:372]: tls_dump_cert_info(): tls_accept: client certificate subject:/C=UA/ST=Lviv/O=Test/OU=Dev/CN=first.my-domain.com/emailAddress=volodya@my-domain.com Jun 25 15:47:05 kamailio-dev /usr/sbin/kamailio[9842]: DEBUG: tls [tls_server.c:376]: tls_dump_cert_info(): tls_accept: client certificate issuer:/C=UA/ST=Lviv/L=Lviv/O=Test/OU=Dev/CN=first.my-domain.com/emailAddress=volodya@my-domain.com ```

... but **second** phone can not: ``` Jun 25 15:43:51 kamailio-dev /usr/sbin/kamailio[9354]: DEBUG: <core> [core/ip_addr.c:229]: print_ip(): tcpconn_new: new tcp connection: office_with_phones_public_ip_address Jun 25 15:43:51 kamailio-dev /usr/sbin/kamailio[9354]: DEBUG: <core> [core/tcp_main.c:999]: tcpconn_new(): on port 53873, type 3 Jun 25 15:43:51 kamailio-dev /usr/sbin/kamailio[9354]: DEBUG: <core> [core/tcp_main.c:1309]: tcpconn_add(): hashes: 1772:3107:4033, 1 Jun 25 15:43:51 kamailio-dev /usr/sbin/kamailio[9354]: DEBUG: <core> [core/io_wait.h:380]: io_watch_add(): DBG: io_watch_add(0xa4ea20, 55, 2, 0x7fc8bd364eb0), fd_no=42 Jun 25 15:43:51 kamailio-dev /usr/sbin/kamailio[9354]: DEBUG: <core> [core/io_wait.h:602]: io_watch_del(): DBG: io_watch_del (0xa4ea20, 55, -1, 0x0) fd_no=43 called Jun 25 15:43:51 kamailio-dev /usr/sbin/kamailio[9354]: DEBUG: <core> [core/tcp_main.c:4196]: handle_tcpconn_ev(): sending to child, events 1 Jun 25 15:43:51 kamailio-dev /usr/sbin/kamailio[9354]: DEBUG: <core> [core/tcp_main.c:3878]: send2child(): selected tcp worker 0 31(9344) for activity on [tls:172.16.30.205:5061], 0x7fc8bd364eb0 Jun 25 15:43:51 kamailio-dev /usr/sbin/kamailio[9344]: DEBUG: <core> [core/tcp_read.c:1740]: handle_io(): received n=8 con=0x7fc8bd364eb0, fd=12 Jun 25 15:43:51 kamailio-dev /usr/sbin/kamailio[9344]: DEBUG: tls [tls_server.c:199]: tls_complete_init(): completing tls connection initialization Jun 25 15:43:51 kamailio-dev /usr/sbin/kamailio[9344]: DEBUG: tls [tls_server.c:228]: tls_complete_init(): Using initial TLS domain TLSs<172.16.30.205:5061> (dom 0x7fc8bcce7fd8 ctx 0x7fc8bcf945b0 sn [first.my-domain.com]) Jun 25 15:43:51 kamailio-dev /usr/sbin/kamailio[9344]: DEBUG: tls [tls_domain.c:724]: sr_ssl_ctx_info_callback(): SSL handshake started Jun 25 15:43:51 kamailio-dev /usr/sbin/kamailio[9344]: DEBUG: tls [tls_domain.c:927]: tls_server_name_cb(): SSL_get_servername returned NULL: return SSL_TLSEXT_ERR_NOACK Jun 25 15:43:51 kamailio-dev /usr/sbin/kamailio[9344]: DEBUG: <core> [core/tcp_main.c:2460]: tcpconn_do_send(): sending... Jun 25 15:43:51 kamailio-dev /usr/sbin/kamailio[9344]: DEBUG: <core> [core/tcp_main.c:2494]: tcpconn_do_send(): after real write: c= 0x7fc8bd364eb0 n=2376 fd=12 Jun 25 15:43:51 kamailio-dev /usr/sbin/kamailio[9344]: DEBUG: <core> [core/tcp_main.c:2495]: tcpconn_do_send(): buf= Jun 25 15:43:51 kamailio-dev /usr/sbin/kamailio[9344]: DEBUG: <core> [core/io_wait.h:380]: io_watch_add(): DBG: io_watch_add(0xa92cc0, 12, 2, 0x7fc8bd364eb0), fd_no=1 Jun 25 15:43:51 kamailio-dev /usr/sbin/kamailio[9344]: ERROR: tls [tls_util.h:42]: tls_err_ret(): TLS accept:error:14094418:SSL routines:SSL3_READ_BYTES:tlsv1 alert unknown ca Jun 25 15:43:51 kamailio-dev /usr/sbin/kamailio[9344]: ERROR: <core> [core/tcp_read.c:1485]: tcp_read_req(): ERROR: tcp_read_req: error reading - c: 0x7fc8bd364eb0 r: 0x7fc8bd364f30 Jun 25 15:43:51 kamailio-dev /usr/sbin/kamailio[9344]: DEBUG: <core> [core/io_wait.h:602]: io_watch_del(): DBG: io_watch_del (0xa92cc0, 12, -1, 0x10) fd_no=2 called Jun 25 15:43:51 kamailio-dev /usr/sbin/kamailio[9344]: DEBUG: <core> [core/tcp_read.c:1664]: release_tcpconn(): releasing con 0x7fc8bd364eb0, state -2, fd=12, id=1 ([office_with_phones_public_ip_address]:53873 -> [office_with_phones_public_ip_address]:5061) Jun 25 15:43:51 kamailio-dev /usr/sbin/kamailio[9344]: DEBUG: <core> [core/tcp_read.c:1665]: release_tcpconn(): extra_data 0x7fc8bd168508 Jun 25 15:43:51 kamailio-dev /usr/sbin/kamailio[9354]: DEBUG: <core> [core/tcp_main.c:3308]: handle_tcp_child(): reader response= 7fc8bd364eb0, -2 from 0 Jun 25 15:43:51 kamailio-dev /usr/sbin/kamailio[9354]: DEBUG: tls [tls_server.c:667]: tls_h_close(): Closing SSL connection 0x7fc8bd168508 ```

10-th line in each output from above shows that last server role which is configured for particular socket is used to establish connection, ignoring previous ones. Please let me know if my configuration is correct or it needs to be adjusted.

Thank you very much!