Hi Henning and all, I can restart kamailio without error so i think kamailio can access the certs file, am i right? Next, i can check the tls configuration via some command and result like: openssl s_client -connect mydomain.com:4443 result is: CONNECTED(00000003) depth=1 C = US, ST = US, L = HCM, O = mydomain.com, OU = mydomain.com, CN = mydomain.com, emailAddress = thanhtruong217(a)gmail.com verify error:num=19:self signed certificate in certificate chain verify return:0 --- Certificate chain 0 s:/ C=US/ST=US/O=mydomain.com/OU=mydomain.com/CN=mydomain.com/emailAddress=than… i:/ C=US/ST=US/L=HCM/O=mydomain.com/OU=mydomain.com/CN=mydomain.com/emailAddres… 1 s:/ C=US/ST=US/L=HCM/O=mydomain.com/OU=mydomain.com/CN=mydomain.com/emailAddres… i:/ C=US/ST=US/L=HCM/O=mydomain.com/OU=mydomain.com/CN=mydomain.com/emailAddres… --- Server certificate -----BEGIN CERTIFICATE----- xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx IKqnZKfVhfs= -----END CERTIFICATE----- subject=/C=US/ST=US/O=mydomain.com/OU=mydomain.com/CN=mydomain.com/emailAdd… issuer=/C=US/ST=US/L=HCM/O=mydomain.com/OU=mydomain.com/CN=mydomain.com/ema… --- No client certificate CA names sent --- SSL handshake has read 2890 bytes and written 391 bytes --- New, TLSv1/SSLv3, Cipher is ECDHE-RSA-AES256-GCM-SHA384 Server public key is 2048 bit Secure Renegotiation IS supported Compression: NONE Expansion: NONE SSL-Session: Protocol : TLSv1.2 Cipher : ECDHE-RSA-AES256-GCM-SHA384 Session-ID: 047913A6C905B007C53EB31C51CBED00FDF8BBBBC8ACDA79238314C3AF899776 Session-ID-ctx: Master-Key: 98D20DD5C85389F6BA32F0CADC76789D03BA3534D45F446418120E8358ACE5142FC21C02E0E3E22090A9E5920F8AB835 Key-Arg : None PSK identity: None PSK identity hint: None SRP username: None TLS session ticket lifetime hint: 7200 (seconds) TLS session ticket: 0000 - fa 90 a9 99 5e 02 04 26-ae bf ce f4 05 06 87 e0 ....^..&........ 0010 - d5 a7 f2 74 ac 4a 7d 0b-ae ba 53 a4 89 14 95 52 ...t.J}...S....R 0020 - 68 53 ea 9b e2 1d 23 ae-77 86 6b 74 21 5e 1e 88 hS....#.w.kt!^.. 0030 - 50 75 3f e4 2a 7a 95 63-5a 87 58 b8 ac c1 ae 85 Pu?.*z.cZ.X..... 0040 - d9 73 3d 4d 5f 27 df 37-37 98 02 15 0c 3c 62 96 .s=M_'.77....<b. 0050 - 50 22 cd 2c e9 b0 aa ba-3e e0 9e a5 65 17 35 3f P".,....>...e.5? 0060 - d5 2d 37 4a 99 1a 19 42-aa 63 6a 74 8b fe 70 72 .-7J...B.cjt..pr 0070 - b6 cc 3d e1 b1 f8 da ee-9c 31 db 25 eb 2a 22 f5 ..=......1.%.*". 0080 - 38 87 13 aa 13 c1 4c c4-f9 1a 83 1c 38 a8 a9 15 8.....L.....8... 0090 - c4 70 cd 3f e5 0a 5e 5e-13 a3 13 a7 6d 29 0e 70 .p.?..^^....m).p 00a0 - fc 09 ee df e0 89 f6 48-29 04 1e 69 65 92 f0 e7 .......H)..ie... Start Time: 1626338959 Timeout : 300 (sec) Verify return code: 19 (self signed certificate in certificate chain) --- or normal tls port 5061: openssl s_client -connect mydomain.com:5061 -tls1 CONNECTED(00000003) depth=1 C = US, ST = US, L = HCM, O = mydomain.com, OU = mydomain.com, CN = mydomain.com, emailAddress = thanhtruong217(a)gmail.com verify error:num=19:self signed certificate in certificate chain verify return:0 --- Certificate chain 0 s:/ C=US/ST=US/O=mydomain.com/OU=mydomain.com/CN=mydomain.com/emailAddress=than… i:/ C=US/ST=US/L=HCM/O=mydomain.com/OU=mydomain.com/CN=mydomain.com/emailAddres… 1 s:/ C=US/ST=US/L=HCM/O=mydomain.com/OU=mydomain.com/CN=mydomain.com/emailAddres… i:/ C=US/ST=US/L=HCM/O=mydomain.com/OU=mydomain.com/CN=mydomain.com/emailAddres… --- Server certificate -----BEGIN CERTIFICATE----- MIIEVDCCAzygAwIBAgIBATANBgkqhkiG9w0BAQsFADCBtTELMAkGA1UEBhMCVVMx xxxxxxxxxx... IKqnZKfVhfs= -----END CERTIFICATE----- subject=/C=US/ST=US/O=mydomain.com/OU=mydomain.com/CN=mydomain.com/emailAdd… issuer=/C=US/ST=US/L=HCM/O=mydomain.com/OU=mydomain.com/CN=mydomain.com/ema… --- No client certificate CA names sent --- SSL handshake has read 2896 bytes and written 307 bytes --- New, TLSv1/SSLv3, Cipher is ECDHE-RSA-AES256-SHA Server public key is 2048 bit Secure Renegotiation IS supported Compression: NONE Expansion: NONE SSL-Session: Protocol : TLSv1 Cipher : ECDHE-RSA-AES256-SHA Session-ID: EF724C7926D18D0B727709E4D42650D2141EA44771E3FF8B566161F51095B0C7 Session-ID-ctx: Master-Key: 61C323CD42A4447B4E662958EA4E5F9DE039A4F257342BBAED236E3B811D6052192FEC36CC245D810A847B9E5FFF54C6 Key-Arg : None PSK identity: None PSK identity hint: None SRP username: None TLS session ticket lifetime hint: 7200 (seconds) TLS session ticket: 0000 - 45 b4 44 76 46 b2 f5 a5-39 a4 ec 4e 53 22 5c 20 E.DvF...9..NS"\ 0010 - d5 a7 f2 74 ac 4a 7d 0b-ae ba 53 a4 89 14 95 52 ...t.J}...S....R 0020 - fe 69 4e 7a 3e 23 ff 41-62 54 f1 71 f5 a3 a4 3f .iNz>#.AbT.q...? 0030 - 99 81 5c d9 71 b6 82 be-7e 17 19 a7 d3 55 6a c9 ..\.q...~....Uj. 0040 - 9f 9c da ef ef 35 54 30-6e 60 6f f1 e2 13 6c 95 .....5T0n`o...l. 0050 - 7e 2a 48 7b 07 51 57 2d-7d 69 7a 8a 46 34 9d 32 ~*H{.QW-}iz.F4.2 0060 - b4 7f 4b a4 61 c6 3a 13-3d 86 af cf 22 be 50 63 ..K.a.:.=...".Pc 0070 - 93 41 3e 18 d3 37 38 bc-cb b2 83 ea 63 8a 1c c0 .A>..78.....c... 0080 - 5a a4 ed 35 18 85 17 9d-24 7c 87 25 ff 98 11 eb Z..5....$|.%.... 0090 - f6 1d 89 41 9b ba a1 18-03 0a 90 90 bd 76 c8 80 ...A.........v.. 00a0 - 44 1f 3a 8c 99 ac 2f ef-a5 e2 22 a6 58 9a e8 2a D.:.../...".X..* Start Time: 1626339048 Timeout : 7200 (sec) Verify return code: 19 (self signed certificate in certificate chain) So, I am not sure what is my issue/wrong here. or can you help me to check more? Thanks, ThanhTruon On Jul 15, 2021, at 15:33, Henning Westerholt &lt;hw(a)skalatan.de&gt; wrote: Hello, please format your e-mail only with black – its really hard to read (it might be related to my client, though). Have you already checked the file system access rights to the certs if kamailio can actually read them? Cheers, Henning -- Henning Westerholt – https://skalatan.de/blog/ Kamailio services – https://gilawa.com *From:* sr-users &lt;sr-users-bounces(a)lists.kamailio.org&gt; *On Behalf Of * ThanhTruong *Sent:* Thursday, July 15, 2021 5:09 AM *To:* Kamailio (SER) - Users Mailing List &lt;sr-users(a)lists.kamailio.org&gt; *Subject:* Re: [SR-Users] please help to configure tls in kamailio for webrtc client like simpl5 Hello Fred and all, I tried some changes, and result bellow. with : [server:default] method = SSLv23 verify_certificate = no require_certificate = no private_key = /etc/certs/mydomain.com/key.pem certificate = /etc/certs/mydomain.com/cert.pem ca_list = /etc/certs/demoCA/cert.pem [client:default] verify_certificate = yes require_certificate = yes ~ error log: Jul 15 03:02:57 ip-172-31-44-170 sbin/kamailio[17590]: ERROR: tls [tls_server.c:1283]: tls_h_read_f(): protocol level error Jul 15 03:02:57 ip-172-31-44-170 sbin/kamailio[17590]: ERROR: tls [tls_util.h:42]: tls_err_ret(): TLS accept:error:14094416:SSL routines:ssl3_read_bytes:sslv3 alert certificate unknown Jul 15 03:02:57 ip-172-31-44-170 sbin/kamailio[17590]: ERROR: tls [tls_server.c:1287]: tls_h_read_f(): source IP: 27.65.214.194 Jul 15 03:02:57 ip-172-31-44-170 sbin/kamailio[17590]: ERROR: tls [tls_server.c:1290]: tls_h_read_f(): destination IP: 172.31.44.170 With settings: [server:default] method = SSLv23 verify_certificate = no require_certificate = no private_key = /etc/certs/mydomain.com/key.pem certificate = /etc/certs/mydomain.com/cert.pem ca_list = /etc/certs/demoCA/cert.pem [client:default] verify_certificate = no require_certificate = no ~ and error log: Jul 15 03:05:28 ip-172-31-44-170 sbin/kamailio[17648]: ERROR: tls [tls_server.c:1283]: tls_h_read_f(): protocol level error Jul 15 03:05:28 ip-172-31-44-170 sbin/kamailio[17648]: ERROR: tls [tls_util.h:42]: tls_err_ret(): TLS accept:error:14094416:SSL routines:ssl3_read_bytes:sslv3 alert certificate unknown Jul 15 03:05:28 ip-172-31-44-170 sbin/kamailio[17648]: ERROR: tls [tls_server.c:1287]: tls_h_read_f(): source IP: 27.65.214.194 Jul 15 03:05:28 ip-172-31-44-170 sbin/kamailio[17648]: ERROR: tls [tls_server.c:1290]: tls_h_read_f(): destination IP: 172.31.44.170 Jul 15 03:05:28 ip-172-31-44-170 sbin/kamailio[17648]: ERROR: <core> [core/tcp_read.c:1493]: tcp_read_req(): ERROR: tcp_read_req: error reading - c: 0x7fd64ee4bfc0 r: 0x7fd64ee4c0e8 (-1) and tried: [server:default] method = SSLv23 verify_certificate = yes require_certificate = yes private_key = /etc/certs/mydomain.com/key.pem certificate = /etc/certs/mydomain.com/cert.pem ca_list = /etc/certs/demoCA/cert.pem [client:default] verify_certificate = no require_certificate = no and error log: Jul 15 03:06:37 ip-172-31-44-170 sbin/kamailio[17703]: ERROR: tls [tls_server.c:1283]: tls_h_read_f(): protocol level error Jul 15 03:06:37 ip-172-31-44-170 sbin/kamailio[17703]: ERROR: tls [tls_util.h:42]: tls_err_ret(): TLS accept:error:14094416:SSL routines:ssl3_read_bytes:sslv3 alert certificate unknown Jul 15 03:06:37 ip-172-31-44-170 sbin/kamailio[17703]: ERROR: tls [tls_server.c:1287]: tls_h_read_f(): source IP: 27.65.214.194 Jul 15 03:06:37 ip-172-31-44-170 sbin/kamailio[17703]: ERROR: tls [tls_server.c:1290]: tls_h_read_f(): destination IP: 172.31.44.170 Jul 15 03:06:37 ip-172-31-44-170 sbin/kamailio[17703]: ERROR: <core> [core/tcp_read.c:1493]: tcp_read_req(): ERROR: tcp_read_req: error reading - c: 0x7f222a018fc0 r: 0x7f222a0190e8 (-1) Then, i try with TLSv1+ [server:default] method = TLSv1+ verify_certificate = yes require_certificate = yes private_key = /etc/certs/mydomain.com/key.pem certificate = /etc/certs/mydomain.com/cert.pem ca_list = /etc/certs/demoCA/cert.pem [client:default] verify_certificate = no require_certificate = no and log is: Jul 15 03:08:33 ip-172-31-44-170 sbin/kamailio[17826]: ERROR: tls [tls_server.c:1283]: tls_h_read_f(): protocol level error Jul 15 03:08:33 ip-172-31-44-170 sbin/kamailio[17826]: ERROR: tls [tls_util.h:42]: tls_err_ret(): TLS accept:error:14094416:SSL routines:ssl3_read_bytes:sslv3 alert certificate unknown Jul 15 03:08:33 ip-172-31-44-170 sbin/kamailio[17826]: ERROR: tls [tls_server.c:1287]: tls_h_read_f(): source IP: 27.65.214.194 Jul 15 03:08:33 ip-172-31-44-170 sbin/kamailio[17826]: ERROR: tls [tls_server.c:1290]: tls_h_read_f(): destination IP: 172.31.44.170 Jul 15 03:08:33 ip-172-31-44-170 sbin/kamailio[17826]: ERROR: <core> [core/tcp_read.c:1493]: tcp_read_req(): ERROR: tcp_read_req: error reading - c: 0x7f9fd21cefc0 r: 0x7f9fd21cf0e8 (-1) I am sorry to border you and all, but i dont know how to get it works, please suggest. thank you so much. On Jul 15, 2021, at 01:10, Fred Posner &lt;fred(a)palner.com&gt; wrote: On 7/14/21 2:04 PM, ThanhTruong wrote: verify_certificate =yes require_certificate =yes Change both of those to no in your case. -- Fred Posner -- www.palner.com Matrix: @fred:matrix.lod.com __________________________________________________________ Kamailio - Users Mailing List - Non Commercial Discussions * sr-users(a)lists.kamailio.org Important: keep the mailing list in the recipients, do not reply only to the sender! Edit mailing list options or unsubscribe: * https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users __________________________________________________________ Kamailio - Users Mailing List - Non Commercial Discussions * sr-users(a)lists.kamailio.org Important: keep the mailing list in the recipients, do not reply only to the sender! Edit mailing list options or unsubscribe: * https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users

[client:default] verify_certificate =yes require_certificate =yes

tls_accept: client did not present a certificate

i am not sure what is the issue.

On Jul 15, 2021, at 22:28, ThanhTruong &lt;thanhtruong217(a)gmail.com&gt; wrote: Hello Fred and all, I set to no and try again, same issue. this is tls.cfg [server:default] method = TLSv1+ verify_certificate = no require_certificate = no private_key = /etc/letsencrypt/live/mydomain.com/privkey.pem <http://mydomain.com/privkey.pem> certificate = /etc/letsencrypt/live/mydomain.com/fullchain.pem <http://mydomain.com/fullchain.pem> [client:default] verify_certificate = no require_certificate = no and log is same Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24072]: DEBUG: <core> [core/ip_addr.c:229]: print_ip(): tcpconn_new: new tcp connection: 27.65.214.194 Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24072]: DEBUG: <core> [core/tcp_main.c:1174]: tcpconn_new(): on port 64742, type 3, socket 40 Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24072]: DEBUG: <core> [core/tcp_main.c:1493]: tcpconn_add(): hashes: 303:768:633, 1 Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24072]: DEBUG: <core> [core/io_wait.h:375]: io_watch_add(): DBG: io_watch_add(0x558c2e300aa0, 40, 2, 0x7fb1a8451258), fd_no=32 Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24072]: DEBUG: <core> [core/io_wait.h:600]: io_watch_del(): DBG: io_watch_del (0x558c2e300aa0, 40, -1, 0x0) fd_no=33 called Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24072]: DEBUG: <core> [core/tcp_main.c:4456]: handle_tcpconn_ev(): sending to child, events 1 Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24072]: DEBUG: <core> [core/tcp_main.c:4126]: send2child(): selected tcp worker idx:0 proc:10 pid:24060 for activity on [tls:172.31.44.170:4443], 0x7fb1a8451258 Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24060]: DEBUG: <core> [core/tcp_read.c:1749]: handle_io(): received n=8 con=0x7fb1a8451258, fd=9 Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24060]: DEBUG: tls [tls_server.c:199]: tls_complete_init(): completing tls connection initialization Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24060]: DEBUG: tls [tls_server.c:228]: tls_complete_init(): Using initial TLS domain TLSs<default> (dom 0x7fb1a82d20a8 ctx 0x7fb1a83242e8 sn []) Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24060]: DEBUG: tls [tls_domain.c:1177]: tls_lookup_private_key(): Private key lookup for SSL_CTX-0x7fb1a83242e8: (nil) Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24060]: DEBUG: tls [tls_domain.c:747]: sr_ssl_ctx_info_callback(): SSL handshake started Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24060]: DEBUG: tls [tls_domain.c:948]: tls_server_name_cb(): received server_name (TLS extension): 'mydomain.com <http://mydomain.com/>' Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24060]: DEBUG: tls [tls_domain.c:967]: tls_server_name_cb(): TLS cfg domain selected for received server name [mydomain.com <http://mydomain.com/>]: socket [:0] server name='' - switching SSL CTX to 0x7fb1a83242e8 dom 0x7fb1a82d20a8 (default) Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24060]: DEBUG: <core> [core/tcp_main.c:2705]: tcpconn_do_send(): sending... Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24060]: DEBUG: <core> [core/tcp_main.c:2738]: tcpconn_do_send(): after real write: c= 0x7fb1a8451258 n=4593 fd=9 Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24060]: DEBUG: <core> [core/tcp_main.c:2739]: tcpconn_do_send(): buf=#012#026#003#003 Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24060]: DEBUG: <core> [core/io_wait.h:375]: io_watch_add(): DBG: io_watch_add(0x558c2e36c740, 9, 2, 0x7fb1a8451258), fd_no=1 Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24060]: DEBUG: tls [tls_domain.c:1177]: tls_lookup_private_key(): Private key lookup for SSL_CTX-0x7fb1a83242e8: (nil) Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24060]: DEBUG: tls [tls_domain.c:759]: sr_ssl_ctx_info_callback(): SSL handshake done Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24060]: DEBUG: tls [tls_domain.c:747]: sr_ssl_ctx_info_callback(): SSL handshake started Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24060]: DEBUG: tls [tls_domain.c:751]: sr_ssl_ctx_info_callback(): SSL renegotiation initiated by client Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24060]: DEBUG: tls [tls_domain.c:759]: sr_ssl_ctx_info_callback(): SSL handshake done Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24060]: DEBUG: tls [tls_domain.c:747]: sr_ssl_ctx_info_callback(): SSL handshake started Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24060]: DEBUG: tls [tls_domain.c:751]: sr_ssl_ctx_info_callback(): SSL renegotiation initiated by client Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24060]: DEBUG: tls [tls_domain.c:759]: sr_ssl_ctx_info_callback(): SSL handshake done Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24060]: DEBUG: tls [tls_server.c:424]: tls_accept(): TLS accept successful Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24060]: DEBUG: tls [tls_server.c:431]: tls_accept(): tls_accept: new connection from 27.65.214.194:64742 using TLSv1.3 TLS_AES_256_GCM_SHA384 256 Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24060]: DEBUG: tls [tls_server.c:434]: tls_accept(): tls_accept: local socket: 172.31.44.170:4443 Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24060]: DEBUG: tls [tls_server.c:445]: tls_accept(): tls_accept: client did not present a certificate Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24060]: DEBUG: tls [tls_server.c:1199]: tls_h_read_f(): Reading on a renegotiation of connection (n:569) (0) Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24060]: DEBUG: <core> [core/tcp_read.c:1515]: tcp_read_req(): EOF Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24060]: DEBUG: <core> [core/io_wait.h:600]: io_watch_del(): DBG: io_watch_del (0x558c2e36c740, 9, -1, 0x10) fd_no=2 called Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24060]: DEBUG: <core> [core/tcp_read.c:1884]: handle_io(): removing from list 0x7fb1a8451258 id 1 fd 9, state 2, flags 4018, main fd 40, refcnt 2 ([27.65.214.194]:64742 -> [27.65.214.194]:4443) Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24060]: DEBUG: <core> [core/tcp_read.c:1668]: release_tcpconn(): releasing con 0x7fb1a8451258, state -1, fd=9, id=1 ([27.65.214.194]:64742 -> [27.65.214.194]:4443) Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24060]: DEBUG: <core> [core/tcp_read.c:1672]: release_tcpconn(): extra_data 0x7fb1a8431bc8 Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24072]: DEBUG: <core> [core/tcp_main.c:3558]: handle_tcp_child(): reader response= 7fb1a8451258, -1 from 0 Jul 15 15:27:51 ip-172-31-44-170 sbin/kamailio[24072]: DEBUG: tls [tls_server.c:683]: tls_h_tcpconn_close_f(): Closing SSL connection 0x7fb1a8431bc8 :) Thanks, Thanhtruong