THE CERTIFICATE BEHIND THE CONNECTION

TLS certificate checker.

Inspect SSL/TLS certificates for any public domain or subdomain.

Checks HTTPS on port 443, including subject alternative names, validity dates and the presented chain.

SSL certificate

TLSv1.3

mailhost.coreswitch.net · 141.138.201.203:443

Unverified

Certificate verification failed. These are unverified certificate details presented by the server. SSL operation failed with code 1. OpenSSL Error messages: error:0A000086:SSL routines::certificate verify failed

The certificate has expired.

Certificate verification failed

Subject: C=US O=Unspecified CN=s2.coreswitch.net emailAddress=root@s2.coreswitch.net
Issuer: C=US O=Unspecified OU=ca-5107344674348926636 CN=s2.coreswitch.net emailAddress=root@s2.coreswitch.net
Valid from: 2020-12-16T09:43:37+00:00
Expires: 2021-12-21T11:23:37+00:00
Days remaining: -1737
Serial (hex): 7A593BB9F82D6439
Signature: RSA-SHA256
Public key: RSA 2048

Subject alternative names (SAN)

DNS:s2.coreswitch.net

SHA-256 fingerprint

AF:E1:B9:AF:20:BE:F4:CF:35:03:F4:53:F0:C7:A2:A3:48:38:B2:A7:58:D7:71:E4:0B:FD:F8:E3:1C:ED:F4:86

Certificate extensions & PEM

keyUsage: Digital Signature, Key Encipherment
extendedKeyUsage: TLS Web Server Authentication
basicConstraints: CA:FALSE
subjectAltName: DNS:s2.coreswitch.net
authorityKeyIdentifier: E4:86:6B:28:FA:76:65:B5:BC:EB:74:30:47:17:6D:EB:CA:EB:F3:B6

-----BEGIN CERTIFICATE-----
MIIE4TCCAsmgAwIBAgIIelk7ufgtZDkwDQYJKoZIhvcNAQELBQAwgYcxCzAJBgNV
BAYTAlVTMRQwEgYDVQQKDAtVbnNwZWNpZmllZDEfMB0GA1UECwwWY2EtNTEwNzM0
NDY3NDM0ODkyNjYzNjEaMBgGA1UEAwwRczIuY29yZXN3aXRjaC5uZXQxJTAjBgkq
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aWZpZWQxGjAYBgNVBAMMEXMyLmNvcmVzd2l0Y2gubmV0MSUwIwYJKoZIhvcNAQkB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-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-09-23T01:19:07+00:00

Server-presented chain · 1 additional certificate

Chain certificate 1

Subject: C=US O=Unspecified OU=ca-5107344674348926636 CN=s2.coreswitch.net emailAddress=root@s2.coreswitch.net
Issuer: C=US O=Unspecified OU=ca-5107344674348926636 CN=s2.coreswitch.net emailAddress=root@s2.coreswitch.net
Valid from: 2020-12-16T09:43:37+00:00
Expires: 2021-12-21T11:23:37+00:00
Days remaining: -1737
Serial (hex): 46E0EEEBE40D06AC
Signature: RSA-SHA256
Public key: RSA 4096

Subject alternative names (SAN)

DNS:s2.coreswitch.net

SHA-256 fingerprint

88:E1:F7:1F:31:B2:6A:60:21:ED:0E:15:E1:1E:CA:CC:51:03:31:63:1F:49:73:51:DD:1B:1B:8A:03:45:80:5B

Certificate extensions & PEM

keyUsage: Digital Signature, Key Encipherment, Certificate Sign
basicConstraints: CA:TRUE
nameConstraints: Permitted: DNS:s2.coreswitch.net
subjectAltName: DNS:s2.coreswitch.net
subjectKeyIdentifier: E4:86:6B:28:FA:76:65:B5:BC:EB:74:30:47:17:6D:EB:CA:EB:F3:B6

-----BEGIN CERTIFICATE-----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fR310ArVj7ZidD0cKY7El6SZfYo8ntUqNJUxa1nTlklS7qskuPaZH8nfLvS1oYvQ
uuhA+H8Uk0Oa0Jt+yQo3y4MHKNWXlYjIh7knAgMBAAGjfzB9MA4GA1UdDwEB/wQE
AwICpDAMBgNVHRMEBTADAQH/MCAGA1UdHgQZMBegFTATghFzMi5jb3Jlc3dpdGNo
Lm5ldDAcBgNVHREEFTATghFzMi5jb3Jlc3dpdGNoLm5ldDAdBgNVHQ4EFgQU5IZr
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pLKMOw+2A+JjkZvzEdMhfF5yVInE
-----END CERTIFICATE-----

One endpoint on port 443. Server-presented chain; no revocation, OCSP, CT or full TLS security scan.

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