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Use openssl s_client -connect like this

ychaouche@ychaouche-PC 10:25:04 ~ $ openssl s_client -connect 10.10.10.20:993
CONNECTED(00000003)
depth=0 CN = messagerie.algerian-radio.dz
verify error:num=20:unable to get local issuer certificate
verify return:1
depth=0 CN = messagerie.algerian-radio.dz
verify error:num=27:certificate not trusted
verify return:1
depth=0 CN = messagerie.algerian-radio.dz
verify error:num=21:unable to verify the first certificate
verify return:1
---
Certificate chain
 0 s:/CN=messagerie.algerian-radio.dz
   i:/C=US/O=Let's Encrypt/CN=Let's Encrypt Authority X3
---
Server certificate
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
subject=/CN=messagerie.algerian-radio.dz
issuer=/C=US/O=Let's Encrypt/CN=Let's Encrypt Authority X3
---
No client certificate CA names sent
---
SSL handshake has read 2515 bytes and written 453 bytes
---
New, TLSv1/SSLv3, Cipher is ECDHE-RSA-AES256-GCM-SHA384
Server public key is 4096 bit
Secure Renegotiation IS supported
Compression: NONE
Expansion: NONE
SSL-Session:
    Protocol  : TLSv1.2
    Cipher    : ECDHE-RSA-AES256-GCM-SHA384
    Session-ID: 51BE9EE4E4D193D8A824A93F9995FA4DAEE8F53E721C68C57B12833F702FCE88
    Session-ID-ctx: 
    Master-Key: 3119C5AAD72C4864C2807CD672547C3CB9699EFD56E9EF8C3227B765189F9A16438418615CCD11EFE6DCD32C719948B2
    Key-Arg   : None
    PSK identity: None
    PSK identity hint: None
    SRP username: None
    TLS session ticket lifetime hint: 300 (seconds)
    TLS session ticket:
    0000 - 76 1a f7 a9 3f fe c3 8d-b9 26 78 8c f6 73 c1 08   v...?....&x..s..
    0010 - 64 c3 17 f8 66 2d fb f4-bd fc d4 71 b2 c7 79 08   d...f-.....q..y.
    0020 - a0 2e e6 89 05 06 ad b3-4b 98 b0 ac a2 79 dd 76   ........K....y.v
    0030 - 0f 67 c9 40 ad 03 81 40-4f 2a 2f 18 b7 63 40 a4   .g.@...@O*/..c@.
    0040 - 84 00 5b e6 96 73 b3 96-6a 6f ea af ca 00 83 09   ..[..s..jo......
    0050 - 15 9c a9 80 83 9d 98 72-3d 2e 4e f3 be a9 35 df   .......r=.N...5.
    0060 - c6 0a 9e c3 d2 da 73 c0-d1 7d fb 7f a9 ac 51 82   ......s..}....Q.
    0070 - 47 96 48 32 6a 6b 8b 51-8b 34 6e b7 f5 65 10 b1   G.H2jk.Q.4n..e..
    0080 - 04 ae e6 19 d9 0a 1f 16-e8 8d a2 7d 18 0f 5e d0   ...........}..^.
    0090 - 7a 20 35 9e 98 39 81 35-9b 81 6f 35 3b d0 26 d4   z 5..9.5..o5;.&.

    Start Time: 1473326800
    Timeout   : 300 (sec)
    Verify return code: 21 (unable to verify the first certificate)
---
* OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE AUTH=PLAIN AUTH=LOGIN] Dovecot ready.
a login a.chaouche@algerian-radio.dz password
a OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE SORT SORT=DISPLAY THREAD=REFERENCES THREAD=REFS THREAD=ORDEREDSUBJECT MULTIAPPEND URL-PARTIAL CATENATE UNSELECT CHILDREN NAMESPACE UIDPLUS LIST-EXTENDED I18NLEVEL=1 CONDSTORE QRESYNC ESEARCH ESORT SEARCHRES WITHIN CONTEXT=SEARCH LIST-STATUS SPECIAL-USE BINARY MOVE QUOTA ACL RIGHTS=texk] Logged in
^C
ychaouche@ychaouche-PC 10:27:05 ~ $ 

contact : @ychaouche yacinechaouche at yahoocom


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