Certificate validity check with OpenSSL client

Here is how you can check certificate validity and troubleshoot TLS connection issues using OpenSSL client command-line utility:

# openssl s_client -showcerts -connect domain.com:443
CONNECTED(00000003)
depth=2 C = US, O = Internet Security Research Group, CN = ISRG Root X1
verify return:1
depth=1 C = US, O = Let's Encrypt, CN = R10
verify return:1
depth=0 CN = domain.com
verify return:1
---
Certificate chain
 0 s:/CN=domain.com
   i:/C=US/O=Let's Encrypt/CN=R10
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
 1 s:/C=US/O=Let's Encrypt/CN=R10
   i:/C=US/O=Internet Security Research Group/CN=ISRG Root X1
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
---
Server certificate
subject=/CN=domain.com
issuer=/C=US/O=Let's Encrypt/CN=R10
---
No client certificate CA names sent
Peer signing digest: SHA512
Server Temp Key: ECDH, P-256, 256 bits
---
SSL handshake has read 3761 bytes and written 415 bytes
---
New, TLSv1/SSLv3, Cipher is ECDHE-RSA-AES128-GCM-SHA256
Server public key is 4096 bit
Secure Renegotiation IS supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
SSL-Session:
    Protocol  : TLSv1.2
    Cipher    : ECDHE-RSA-AES128-GCM-SHA256
    Session-ID: 127C68CB0675B782FB511098EE0D63E17D0F3B66FB2C93471BD8097A266F4CC8
    Session-ID-ctx:
    Master-Key: B433A5B2E0B018C56A5DFE9983DDD4D7C7D5CAC6F4319492DBB11662522FB0B4A2F17A564F8D63F4D43343F91B5E61F0
    Key-Arg   : None
    Krb5 Principal: None
    PSK identity: None
    PSK identity hint: None
    TLS session ticket lifetime hint: 300 (seconds)
    TLS session ticket:
    0000 - 3f 77 72 a9 d1 18 10 06-c7 f0 cc 7e a3 f4 99 9f   ?wr........~....
    0010 - 32 d1 cd 92 36 eb c5 79-01 7b c0 19 2d 36 77 b9   2...6..y.{..-6w.
    0020 - a2 b8 da e6 53 20 20 01-dc 8b 25 10 86 53 cf 71   ....S  ...%..S.q
    0030 - 36 27 dd 92 d6 ce a5 43-eb f9 f5 3e 06 13 26 f7   6'.....C...>..&.
    0040 - c3 76 cd 96 cf c9 f3 24-f6 ac 95 71 13 95 90 5e   .v.....$...q...^
    0050 - a3 c9 aa 7f 4d 41 e1 2b-21 3a 32 6c f4 e4 54 66   ....MA.+!:2l..Tf
    0060 - 93 0f e9 b8 08 74 6c 07-11 07 93 da 56 ea c9 46   .....tl.....V..F
    0070 - 86 d6 13 e7 d3 20 c1 8d-dd b7 c2 fe 14 1d 46 6a   ..... ........Fj
    0080 - ed a1 1f 16 bf 8b f2 98-7e 82 fb c9 cd 1c 04 4b   ........~......K
    0090 - 55 88 79 4d f8 58 72 8b-76 ec 2b 07 74 fc 60 02   U.yM.Xr.v.+.t.`.
    00a0 - 2a f1 b7 59 99 3b b3 bd-b2 a1 9d e0 4b 85 74 a8   *..Y.;......K.t.
    00b0 - 43 e4 99 64 67 c5 bd 42-d1 21 4a fa 18 1a d3 71   C..dg..B.!J....q

    Start Time: 1739976742
    Timeout   : 300 (sec)
    Verify return code: 0 (ok)
---
read:errno=0

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# openssl s_client -showcerts -connect domain.com:443

CONNECTED(00000003)

depth=2 C = US, O = Internet Security Research Group, CN = ISRG Root X1

verify return:1

depth=1 C = US, O = Let's Encrypt, CN = R10

verify return:1

depth=0 CN = domain.com

verify return:1

---

Certificate chain

0 s:/CN=domain.com

i:/C=US/O=Let's Encrypt/CN=R10

-----BEGIN CERTIFICATE-----

MIIF7jCCBNagAwIBAgISA1XdpETwO0ian7y2qVNABOhuMA0GCSqGSIb3DQEBCwUA

MDMxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MQwwCgYDVQQD

EwNSMTAwHhcNMjQxMjE3MTMyODU0WhcNMjUwMzE3MTMyODUzWjAZMRcwFQYDVQQD

Ew5wYnguZ29jYWxsLmFwcDCCAiIwDQYJKoZIhvcNAQEBBQADggIPADCCAgoCggIB

ANUffjLn8J0WEQk+/g01WumVI6z2JMKUUKoSeETBgQR3kwFLbQgoHPSJ7xY1GiLK

5OnY2FgW0YKmuW0SS0d4onYFliXwuq/jHralo2N7ggVFDrRGnoAEevtlOp79f81y

jp1+b7pHT2tdnrLGA5ZbpIIJR4Bj5eleZzp2k9Ss1kA1wXfJg49kxM/IRAMyMiiQ

/Yq/3TmxHSNJ6zpaGCGQJvXMS2jMI44or80Km0i/l5BCYIA6S+BWpoTzhHXfyvAw

KwYz6weL6U4V+RY7P+a5XfGwjiFMb7gm6tqH+wfqysIInNfBG+bVF+wUvaqZmJYV

bB/tcs+zRPlMfeyDYVjYeysdO6sfVCof6saLsYPdn8BH1xbw7BO93q9z/gkkGtCW

BL4CZkm3QCvVa9IjL/og8kNdzpFrRrkbfslPjWk7mzkVQfBimzNMWOgv1e/jmZXK

Ph7JfMRllcMJ5IUtXNyctIR9R5C96aD2k1qyL0DiKSjbMcKiN4posn6WuCFREq22

Xah/n7g3xrA32xJEqvlVuyU/F2MntOLmQWWs8Z4XFDNTnsrT+/hWZI5UuYoeMgNU

jKt4O2DCI4zQhxfiVdjiGrcsOSrokudXfshnxKnGYCcP6PrBT0NtobM1psUMf4GR

NtU8sdYuAXe7Pij9+hg0OGoT7GVx6eCo/z+Wt065CEG1AgMBAAGjggIUMIICEDAO

BgNVHQ8BAf8EBAMCBaAwHQYDVR0lBBYwFAYIKwYBBQUHAwEGCCsGAQUFBwMCMAwG

A1UdEwEB/wQCMAAwHQYDVR0OBBYEFBGzX3kvPPqvYlQCBB2D0H906ODtMB8GA1Ud

IwQYMBaAFLu8w0el5LypxsOkcgwQjaI14cjoMFcGCCsGAQUFBwEBBEswSTAiBggr

BgEFBQcwAYYWaHR0cDovL3IxMC5vLmxlbmNyLm9yZzAjBggrBgEFBQcwAoYXaHR0

cDovL3IxMC5pLmxlbmNyLm9yZy8wGQYDVR0RBBIwEIIOcGJ4LmdvY2FsbC5hcHAw

EwYDVR0gBAwwCjAIBgZngQwBAgEwggEGBgorBgEEAdZ5AgQCBIH3BIH0APIAdwCi

4wrkRe+9rZt+OO1HZ3dT14JbhJTXK14bLMS5UKRH5wAAAZPVBDxeAAAEAwBIMEYC

IQDcdP/962yVxS8cjY+S7d1QCcQQGk35xYft+Spa7Igl2AIhAIWzLNVKRgKb/Gcv

mEa2tIdil4nR7CVQGutXZzZnqtThAHcAzxFW7tUufK/zh1vZaS6b6RpxZ0qwF+ys

AdJbd87MOwgAAAGT1QQ8kwAABAMASDBGAiEA1m5xBk2kwrh29yQA6ihRhFc0Vmow

s3EY9bL+xdRcbOECIQConlKg04LC7pqFuN8H+CbBLMrBF5kt7VOj7Ln/yV6nHDAN

BgkqhkiG9w0BAQsFAAOCAQEAGAan+4RpRCCADEWmvuyZGdprhJThkWlx3SX+Ze1D

dvwrP61Gcd/N8YzM//uHl6rXVFOJZ53xH95ReUbY8ChpHvWYsBXPfzmT48Xu3P8P

bhf7nJDCuIy2HXEh/7HaWCxsJc/gveLS8j7WB+zCaFbQRIN/zz2PONAW0BYyumuS

UF2OJad/Ro+EtpsL3zCYhczpkpNJ9Swqlt+1oPJMluANCt1OZIjoAqrBS9/IXvGE

sveXwZphW57OqAm8fUh9KKpPFYXdagIGDb/lmUAMvpH8IQi6+LuaqFgpU4HpkOOs

AgwFlMmnq2xLM1N+CMXamVAhqcOQprog==

-----END CERTIFICATE-----

1 s:/C=US/O=Let's Encrypt/CN=R10

i:/C=US/O=Internet Security Research Group/CN=ISRG Root X1

-----BEGIN CERTIFICATE-----

MIIFBTCCAu2gAwIBAgIQS6hSk/eaL6JzBkuoBI110DANBgkqhkiG9w0BAQsFADBP

MQswCQYDVQQGEwJVUzEpMCcGA1UEChMgSW50ZXJuZXQgU2VjdXJpdHkgUmVzZWFy

Y2ggR3JvdXAxFTATBgNVBAMTDElTUkcgUm9vdCBYMTAeFw0yNDAzMTMwMDAwMDBa

Fw0yNzAzMTIyMzU5NTlaMDMxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBF

bmNyeXB0MQwwCgYDVQQDEwNSMTAwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEK

AoIBAQDPV+XmxFQS7bRH/sknWHZGUCiMHT6I3wWd1bUYKb3dtVq/+vbOo76vACFL

YlpaPAEvxVgD9on/jhFD68G14BQHlo9vH9fnuoE5CXVlt8KvGFs3Jijno/QHK20a

/6tYvJWuQP/py1fEtVt/eA0YYbwX51TGu0mRzW4Y0YCF7qZlNrx06rxQTOr8IfM4

FpOUurDTazgGzRYSespSdcitdrLCnF2YRVxvYXvGLe48E1KGAdlX5jgc3421H5KR

mudKHMxFqHJV8LDmowfs/acbZp4/SItxhHFYyTr6717yW0QrPHTnj7JHwQdqzZq3

DZb3EoEmUVQK7GH29/Xi8orIlQ2NAgMBAAGjgfgwgfUwDgYDVR0PAQH/BAQDAgGG

MB0GA1UdJQQWMBQGCCsGAQUFBwMCBggrBgEFBQcDATASBgNVHRMBAf8ECDAGAQH/

AgEAMB0GA1UdDgQWBBS7vMNHpeS8qcbDpHIMEI2iNeHI6DAfBgNVHSMEGDAWgBR5

tFnme7bl5AFzgAiIyBpY9umbbjAyBggrBgEFBQcBAQQmMCQwIgYIKwYBBQUHMAKG

Fmh0dHA6Ly94MS5pLmxlbmNyLm9yZy8wEwYDVR0gBAwwCjAIBgZngQwBAgEwJwYD

VR0fBCAwHjAcoBqgGIYWaHR0cDovL3gxLmMubGVuY3Iub3JnLzANBgkqhkiG9w0B

AQsFAAOCAgEAkrHnQTfreZ2B5s3iJeE6IOmQRJWjgVzPw139vaBw1bGWKCIL0vIo

zwzn1OZDjCQiHcFCktEJr59L9MhwTyAWsVrdAfYf+B9haxQnsHKNY67u4s5Lzzfd

u6PUzeetUK29v+PsPmI2cJkxp+iN3epi4hKu9ZzUPSwMqtCceb7qPVxEbpYxY1p9

1n5PJKBLBX9eb9LU6l8zSxPWV7bK3lG4XaMJgnT9x3ies7msFtpKK5bDtotij/l0

GaKeA97pb5uwD9KgWvaFXMIEt8jVTjLEvwRdvCn294GPDF08U8lAkIv7tghluaQh

1QnlE4SEN4LOECj8dsIGJXpGUk3aU3KkJz9icKy+aUgA+2cP21uh6NcDIS3XyfaZ

QjmDQ993ChII8SXWupQZVBiIpcWO4RqZk3lr7Bz5MUCwzDIA359e57SSq5CCkY0N

4B6Vulk7LktfwrdGNVI5BsC9qqxSwSKgRJeZ9wygIaehbHFHFhcBaMDKpiZlBHyz

rsnnlFXCb5s8HKn5LsUgGvB24L7sGNZP2CX7dhHov+YhD+jozLW2p9W4959Bz2Ei

RmqDtmiXLnzqTpXbI+suyCsohKRg6Un0RC47+cpiVwHiXZAW+cn8eiNIjqbVgXLx

KPpdzvvtTnOPlCunr3Bf9b77AiC/36dRILKz7OA54=

-----END CERTIFICATE-----

---

Server certificate

subject=/CN=domain.com

issuer=/C=US/O=Let's Encrypt/CN=R10

---

No client certificate CA names sent

Peer signing digest: SHA512

Server Temp Key: ECDH, P-256, 256 bits

---

SSL handshake has read 3761 bytes and written 415 bytes

---

New, TLSv1/SSLv3, Cipher is ECDHE-RSA-AES128-GCM-SHA256

Server public key is 4096 bit

Secure Renegotiation IS supported

Compression: NONE

Expansion: NONE

No ALPN negotiated

SSL-Session:

Protocol : TLSv1.2

Cipher : ECDHE-RSA-AES128-GCM-SHA256

Session-ID: 127C68CB0675B782FB511098EE0D63E17D0F3B66FB2C93471BD8097A266F4CC8

Session-ID-ctx:

Master-Key: B433A5B2E0B018C56A5DFE9983DDD4D7C7D5CAC6F4319492DBB11662522FB0B4A2F17A564F8D63F4D43343F91B5E61F0

Key-Arg : None

Krb5 Principal: None

PSK identity: None

PSK identity hint: None

TLS session ticket lifetime hint: 300 (seconds)

TLS session ticket:

0000 - 3f 77 72 a9 d1 18 10 06-c7 f0 cc 7e a3 f4 99 9f ?wr........~....

0010 - 32 d1 cd 92 36 eb c5 79-01 7b c0 19 2d 36 77 b9 2...6..y.{..-6w.

0020 - a2 b8 da e6 53 20 20 01-dc 8b 25 10 86 53 cf 71 ....S ...%..S.q

0030 - 36 27 dd 92 d6 ce a5 43-eb f9 f5 3e 06 13 26 f7 6'.....C...>..&.

0040 - c3 76 cd 96 cf c9 f3 24-f6 ac 95 71 13 95 90 5e .v.....$...q...^

0050 - a3 c9 aa 7f 4d 41 e1 2b-21 3a 32 6c f4 e4 54 66 ....MA.+!:2l..Tf

0060 - 93 0f e9 b8 08 74 6c 07-11 07 93 da 56 ea c9 46 .....tl.....V..F

0070 - 86 d6 13 e7 d3 20 c1 8d-dd b7 c2 fe 14 1d 46 6a ..... ........Fj

0080 - ed a1 1f 16 bf 8b f2 98-7e 82 fb c9 cd 1c 04 4b ........~......K

0090 - 55 88 79 4d f8 58 72 8b-76 ec 2b 07 74 fc 60 02 U.yM.Xr.v.+.t.`.

00a0 - 2a f1 b7 59 99 3b b3 bd-b2 a1 9d e0 4b 85 74 a8 *..Y.;......K.t.

00b0 - 43 e4 99 64 67 c5 bd 42-d1 21 4a fa 18 1a d3 71 C..dg..B.!J....q

Start Time: 1739976742

Timeout : 300 (sec)

Verify return code: 0 (ok)

---

read:errno=0

Good luck!

Certificate validity check with OpenSSL client

Stay tuned! :)

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Certificate validity check with OpenSSL client

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