SSL Server Test: www.cezesco.cz (Powered by Qualys SSL Labs)

SSL Report: www.cezesco.cz (89.111.76.140)

Assessed on: Wed, 05 Nov 2025 20:40:24 UTC | Clear cache

Due to a recently discovered bug in Apple's code, your browser is exposed to MITM attacks. Click here for more information.

Summary

Overall Rating

A+

100

Certificate

Protocol Support

Key Exchange

Cipher Strength

Visit our documentation page for more information, configuration guides, and books. Known issues are documented here.

This site works only in browsers with SNI support.

This server supports TLS 1.3. MORE INFO »

HTTP Strict Transport Security (HSTS) with long duration deployed on this server. MORE INFO »

Certificate #1: EC 256 bits (SHA256withRSA)

Server Key and Certificate #1
Subject	www.cezesco.cz Fingerprint SHA256: 66aab6d8ed3dce3ad922199246d861f2225c081783448703ff337a9fe04e75a7 Pin SHA256: nwWo6SzE8Kk2JBCX++h2VwVk1f0rtvLZoSeKjtZa8Ck=
Common names	www.cezesco.cz
Alternative names	www.cezesco.cz cezesco.cz
Serial Number	0e5030b9bd8dfb8451ba376e5ab6e3cd
Valid from	Tue, 01 Apr 2025 00:00:00 UTC
Valid until	Tue, 31 Mar 2026 23:59:59 UTC (expires in 4 months and 25 days)
Key	EC 256 bits
Weak key (Debian)	No
Issuer	DigiCert Assured ID TLS RSA4096 SHA256 2022 CA1 AIA: http://cacerts.digicert.com/DigiCertAssuredIDTLSRSA4096SHA2562022CA1.crt
Signature algorithm	SHA256withRSA
Extended Validation	No
Certificate Transparency	Yes (certificate)
OCSP Must Staple	No
Revocation information	CRL, OCSP CRL: http://crl3.digicert.com/DigiCertAssuredIDTLSRSA4096SHA2562022CA1.crl OCSP: http://ocsp.digicert.com
Revocation status	Good (not revoked) CRL ERROR: IOException occurred
DNS CAA	No (more info)
Trusted	Yes Mozilla Apple Android Java Windows

Additional Certificates (if supplied)
Certificates provided	2 (3320 bytes)
Chain issues	None
#2
Subject	DigiCert Assured ID TLS RSA4096 SHA256 2022 CA1 Fingerprint SHA256: 987ff2e3b25a3a14cb843d907b3c7f007c274921afc10017f85d4fae7b0cb8b6 Pin SHA256: t6F6ltc/eNYw0WY4vUTTo7SvuavxVPXIIpqLyWMQG+g=
Valid until	Sat, 08 Nov 2031 23:59:59 UTC (expires in 6 years)
Key	RSA 4096 bits (e 65537)
Issuer	DigiCert Assured ID Root CA
Signature algorithm	SHA256withRSA

Certification Paths


Path #1: Trusted
1	Sent by server	www.cezesco.cz Fingerprint SHA256: 66aab6d8ed3dce3ad922199246d861f2225c081783448703ff337a9fe04e75a7 Pin SHA256: nwWo6SzE8Kk2JBCX++h2VwVk1f0rtvLZoSeKjtZa8Ck= EC 256 bits / SHA256withRSA CRL ERROR: IOException occurred
2	Sent by server	DigiCert Assured ID TLS RSA4096 SHA256 2022 CA1 Fingerprint SHA256: 987ff2e3b25a3a14cb843d907b3c7f007c274921afc10017f85d4fae7b0cb8b6 Pin SHA256: t6F6ltc/eNYw0WY4vUTTo7SvuavxVPXIIpqLyWMQG+g= RSA 4096 bits (e 65537) / SHA256withRSA CRL ERROR: IOException occurred
3	In trust store	DigiCert Assured ID Root CA Self-signed Fingerprint SHA256: 3e9099b5015e8f486c00bcea9d111ee721faba355a89bcf1df69561e3dc6325c Pin SHA256: I/Lt/z7ekCWanjD0Cvj5EqXls2lOaThEA0H2Bg4BT/o= RSA 2048 bits (e 65537) / SHA1withRSA Weak or insecure signature, but no impact on root certificate
Path #1: Trusted
1	Sent by server	www.cezesco.cz Fingerprint SHA256: 66aab6d8ed3dce3ad922199246d861f2225c081783448703ff337a9fe04e75a7 Pin SHA256: nwWo6SzE8Kk2JBCX++h2VwVk1f0rtvLZoSeKjtZa8Ck= EC 256 bits / SHA256withRSA CRL ERROR: IOException occurred
2	Sent by server	DigiCert Assured ID TLS RSA4096 SHA256 2022 CA1 Fingerprint SHA256: 987ff2e3b25a3a14cb843d907b3c7f007c274921afc10017f85d4fae7b0cb8b6 Pin SHA256: t6F6ltc/eNYw0WY4vUTTo7SvuavxVPXIIpqLyWMQG+g= RSA 4096 bits (e 65537) / SHA256withRSA CRL ERROR: IOException occurred
3	In trust store	DigiCert Assured ID Root CA Self-signed Fingerprint SHA256: 3e9099b5015e8f486c00bcea9d111ee721faba355a89bcf1df69561e3dc6325c Pin SHA256: I/Lt/z7ekCWanjD0Cvj5EqXls2lOaThEA0H2Bg4BT/o= RSA 2048 bits (e 65537) / SHA1withRSA Weak or insecure signature, but no impact on root certificate
Path #1: Trusted
1	Sent by server	www.cezesco.cz Fingerprint SHA256: 66aab6d8ed3dce3ad922199246d861f2225c081783448703ff337a9fe04e75a7 Pin SHA256: nwWo6SzE8Kk2JBCX++h2VwVk1f0rtvLZoSeKjtZa8Ck= EC 256 bits / SHA256withRSA CRL ERROR: IOException occurred
2	Sent by server	DigiCert Assured ID TLS RSA4096 SHA256 2022 CA1 Fingerprint SHA256: 987ff2e3b25a3a14cb843d907b3c7f007c274921afc10017f85d4fae7b0cb8b6 Pin SHA256: t6F6ltc/eNYw0WY4vUTTo7SvuavxVPXIIpqLyWMQG+g= RSA 4096 bits (e 65537) / SHA256withRSA CRL ERROR: IOException occurred
3	In trust store	DigiCert Assured ID Root CA Self-signed Fingerprint SHA256: 3e9099b5015e8f486c00bcea9d111ee721faba355a89bcf1df69561e3dc6325c Pin SHA256: I/Lt/z7ekCWanjD0Cvj5EqXls2lOaThEA0H2Bg4BT/o= RSA 2048 bits (e 65537) / SHA1withRSA Weak or insecure signature, but no impact on root certificate
Path #1: Trusted
1	Sent by server	www.cezesco.cz Fingerprint SHA256: 66aab6d8ed3dce3ad922199246d861f2225c081783448703ff337a9fe04e75a7 Pin SHA256: nwWo6SzE8Kk2JBCX++h2VwVk1f0rtvLZoSeKjtZa8Ck= EC 256 bits / SHA256withRSA CRL ERROR: IOException occurred
2	Sent by server	DigiCert Assured ID TLS RSA4096 SHA256 2022 CA1 Fingerprint SHA256: 987ff2e3b25a3a14cb843d907b3c7f007c274921afc10017f85d4fae7b0cb8b6 Pin SHA256: t6F6ltc/eNYw0WY4vUTTo7SvuavxVPXIIpqLyWMQG+g= RSA 4096 bits (e 65537) / SHA256withRSA CRL ERROR: IOException occurred
3	In trust store	DigiCert Assured ID Root CA Self-signed Fingerprint SHA256: 3e9099b5015e8f486c00bcea9d111ee721faba355a89bcf1df69561e3dc6325c Pin SHA256: I/Lt/z7ekCWanjD0Cvj5EqXls2lOaThEA0H2Bg4BT/o= RSA 2048 bits (e 65537) / SHA1withRSA Weak or insecure signature, but no impact on root certificate
Path #1: Trusted
1	Sent by server	www.cezesco.cz Fingerprint SHA256: 66aab6d8ed3dce3ad922199246d861f2225c081783448703ff337a9fe04e75a7 Pin SHA256: nwWo6SzE8Kk2JBCX++h2VwVk1f0rtvLZoSeKjtZa8Ck= EC 256 bits / SHA256withRSA CRL ERROR: IOException occurred
2	Sent by server	DigiCert Assured ID TLS RSA4096 SHA256 2022 CA1 Fingerprint SHA256: 987ff2e3b25a3a14cb843d907b3c7f007c274921afc10017f85d4fae7b0cb8b6 Pin SHA256: t6F6ltc/eNYw0WY4vUTTo7SvuavxVPXIIpqLyWMQG+g= RSA 4096 bits (e 65537) / SHA256withRSA CRL ERROR: IOException occurred
3	In trust store	DigiCert Assured ID Root CA Self-signed Fingerprint SHA256: 3e9099b5015e8f486c00bcea9d111ee721faba355a89bcf1df69561e3dc6325c Pin SHA256: I/Lt/z7ekCWanjD0Cvj5EqXls2lOaThEA0H2Bg4BT/o= RSA 2048 bits (e 65537) / SHA1withRSA Weak or insecure signature, but no impact on root certificate

Click here to expand

Certificate #2: EC 256 bits (SHA256withRSA) No SNI

Server Key and Certificate #1
Subject	www.cezdistribuce.cz Fingerprint SHA256: 95663365d4d7f95826f41d7fc60e4297379b0e98e6a16314f99fe0e85f96f833 Pin SHA256: eFiYr54PGVLKpaLFfwh7NWZ61vwkeIrYZpM4rgYq93c=
Common names	www.cezdistribuce.cz
Alternative names	www.cezdistribuce.cz cezdistribuce.cz chat.cezdistribuce.cz napoveda-dip.cezdistribuce.cz napoveda-pnd.cezdistribuce.cz standardy.cezdistribuce.cz www.napoveda-dip.cezdistribuce.cz www.napoveda-pnd.cezdistribuce.cz www.standardy.cezdistribuce.cz MISMATCH
Serial Number	0d051263600fecf89a1a79307a9370df
Valid from	Tue, 01 Apr 2025 00:00:00 UTC
Valid until	Tue, 31 Mar 2026 23:59:59 UTC (expires in 4 months and 25 days)
Key	EC 256 bits
Weak key (Debian)	No
Issuer	DigiCert Assured ID TLS RSA4096 SHA256 2022 CA1 AIA: http://cacerts.digicert.com/DigiCertAssuredIDTLSRSA4096SHA2562022CA1.crt
Signature algorithm	SHA256withRSA
Extended Validation	No
Certificate Transparency	Yes (certificate)
OCSP Must Staple	No
Revocation information	CRL, OCSP CRL: http://crl3.digicert.com/DigiCertAssuredIDTLSRSA4096SHA2562022CA1.crl OCSP: http://ocsp.digicert.com
Revocation status	Good (not revoked) CRL ERROR: IOException occurred
Trusted	No NOT TRUSTED Mozilla Apple Android Java Windows

Additional Certificates (if supplied)
Certificates provided	2 (3561 bytes)
Chain issues	None
#2
Subject	DigiCert Assured ID TLS RSA4096 SHA256 2022 CA1 Fingerprint SHA256: 987ff2e3b25a3a14cb843d907b3c7f007c274921afc10017f85d4fae7b0cb8b6 Pin SHA256: t6F6ltc/eNYw0WY4vUTTo7SvuavxVPXIIpqLyWMQG+g=
Valid until	Sat, 08 Nov 2031 23:59:59 UTC (expires in 6 years)
Key	RSA 4096 bits (e 65537)
Issuer	DigiCert Assured ID Root CA
Signature algorithm	SHA256withRSA

Certification Paths


Path #1: Not trusted (invalid certificate [Fingerprint SHA256: 95663365d4d7f95826f41d7fc60e4297379b0e98e6a16314f99fe0e85f96f833])
1	Sent by server	www.cezdistribuce.cz Fingerprint SHA256: 95663365d4d7f95826f41d7fc60e4297379b0e98e6a16314f99fe0e85f96f833 Pin SHA256: eFiYr54PGVLKpaLFfwh7NWZ61vwkeIrYZpM4rgYq93c= EC 256 bits / SHA256withRSA CRL ERROR: IOException occurred
2	Sent by server	DigiCert Assured ID TLS RSA4096 SHA256 2022 CA1 Fingerprint SHA256: 987ff2e3b25a3a14cb843d907b3c7f007c274921afc10017f85d4fae7b0cb8b6 Pin SHA256: t6F6ltc/eNYw0WY4vUTTo7SvuavxVPXIIpqLyWMQG+g= RSA 4096 bits (e 65537) / SHA256withRSA CRL ERROR: IOException occurred
3	In trust store	DigiCert Assured ID Root CA Self-signed Fingerprint SHA256: 3e9099b5015e8f486c00bcea9d111ee721faba355a89bcf1df69561e3dc6325c Pin SHA256: I/Lt/z7ekCWanjD0Cvj5EqXls2lOaThEA0H2Bg4BT/o= RSA 2048 bits (e 65537) / SHA1withRSA Weak or insecure signature, but no impact on root certificate
Path #1: Not trusted (invalid certificate [Fingerprint SHA256: 95663365d4d7f95826f41d7fc60e4297379b0e98e6a16314f99fe0e85f96f833])
1	Sent by server	www.cezdistribuce.cz Fingerprint SHA256: 95663365d4d7f95826f41d7fc60e4297379b0e98e6a16314f99fe0e85f96f833 Pin SHA256: eFiYr54PGVLKpaLFfwh7NWZ61vwkeIrYZpM4rgYq93c= EC 256 bits / SHA256withRSA CRL ERROR: IOException occurred
2	Sent by server	DigiCert Assured ID TLS RSA4096 SHA256 2022 CA1 Fingerprint SHA256: 987ff2e3b25a3a14cb843d907b3c7f007c274921afc10017f85d4fae7b0cb8b6 Pin SHA256: t6F6ltc/eNYw0WY4vUTTo7SvuavxVPXIIpqLyWMQG+g= RSA 4096 bits (e 65537) / SHA256withRSA CRL ERROR: IOException occurred
3	In trust store	DigiCert Assured ID Root CA Self-signed Fingerprint SHA256: 3e9099b5015e8f486c00bcea9d111ee721faba355a89bcf1df69561e3dc6325c Pin SHA256: I/Lt/z7ekCWanjD0Cvj5EqXls2lOaThEA0H2Bg4BT/o= RSA 2048 bits (e 65537) / SHA1withRSA Weak or insecure signature, but no impact on root certificate
Path #1: Not trusted (invalid certificate [Fingerprint SHA256: 95663365d4d7f95826f41d7fc60e4297379b0e98e6a16314f99fe0e85f96f833])
1	Sent by server	www.cezdistribuce.cz Fingerprint SHA256: 95663365d4d7f95826f41d7fc60e4297379b0e98e6a16314f99fe0e85f96f833 Pin SHA256: eFiYr54PGVLKpaLFfwh7NWZ61vwkeIrYZpM4rgYq93c= EC 256 bits / SHA256withRSA CRL ERROR: IOException occurred
2	Sent by server	DigiCert Assured ID TLS RSA4096 SHA256 2022 CA1 Fingerprint SHA256: 987ff2e3b25a3a14cb843d907b3c7f007c274921afc10017f85d4fae7b0cb8b6 Pin SHA256: t6F6ltc/eNYw0WY4vUTTo7SvuavxVPXIIpqLyWMQG+g= RSA 4096 bits (e 65537) / SHA256withRSA CRL ERROR: IOException occurred
3	In trust store	DigiCert Assured ID Root CA Self-signed Fingerprint SHA256: 3e9099b5015e8f486c00bcea9d111ee721faba355a89bcf1df69561e3dc6325c Pin SHA256: I/Lt/z7ekCWanjD0Cvj5EqXls2lOaThEA0H2Bg4BT/o= RSA 2048 bits (e 65537) / SHA1withRSA Weak or insecure signature, but no impact on root certificate
Path #1: Not trusted (invalid certificate [Fingerprint SHA256: 95663365d4d7f95826f41d7fc60e4297379b0e98e6a16314f99fe0e85f96f833])
1	Sent by server	www.cezdistribuce.cz Fingerprint SHA256: 95663365d4d7f95826f41d7fc60e4297379b0e98e6a16314f99fe0e85f96f833 Pin SHA256: eFiYr54PGVLKpaLFfwh7NWZ61vwkeIrYZpM4rgYq93c= EC 256 bits / SHA256withRSA CRL ERROR: IOException occurred
2	Sent by server	DigiCert Assured ID TLS RSA4096 SHA256 2022 CA1 Fingerprint SHA256: 987ff2e3b25a3a14cb843d907b3c7f007c274921afc10017f85d4fae7b0cb8b6 Pin SHA256: t6F6ltc/eNYw0WY4vUTTo7SvuavxVPXIIpqLyWMQG+g= RSA 4096 bits (e 65537) / SHA256withRSA CRL ERROR: IOException occurred
3	In trust store	DigiCert Assured ID Root CA Self-signed Fingerprint SHA256: 3e9099b5015e8f486c00bcea9d111ee721faba355a89bcf1df69561e3dc6325c Pin SHA256: I/Lt/z7ekCWanjD0Cvj5EqXls2lOaThEA0H2Bg4BT/o= RSA 2048 bits (e 65537) / SHA1withRSA Weak or insecure signature, but no impact on root certificate
Path #1: Not trusted (invalid certificate [Fingerprint SHA256: 95663365d4d7f95826f41d7fc60e4297379b0e98e6a16314f99fe0e85f96f833])
1	Sent by server	www.cezdistribuce.cz Fingerprint SHA256: 95663365d4d7f95826f41d7fc60e4297379b0e98e6a16314f99fe0e85f96f833 Pin SHA256: eFiYr54PGVLKpaLFfwh7NWZ61vwkeIrYZpM4rgYq93c= EC 256 bits / SHA256withRSA CRL ERROR: IOException occurred
2	Sent by server	DigiCert Assured ID TLS RSA4096 SHA256 2022 CA1 Fingerprint SHA256: 987ff2e3b25a3a14cb843d907b3c7f007c274921afc10017f85d4fae7b0cb8b6 Pin SHA256: t6F6ltc/eNYw0WY4vUTTo7SvuavxVPXIIpqLyWMQG+g= RSA 4096 bits (e 65537) / SHA256withRSA CRL ERROR: IOException occurred
3	In trust store	DigiCert Assured ID Root CA Self-signed Fingerprint SHA256: 3e9099b5015e8f486c00bcea9d111ee721faba355a89bcf1df69561e3dc6325c Pin SHA256: I/Lt/z7ekCWanjD0Cvj5EqXls2lOaThEA0H2Bg4BT/o= RSA 2048 bits (e 65537) / SHA1withRSA Weak or insecure signature, but no impact on root certificate

Click here to expand

Configuration

Protocols
TLS 1.3	Yes
TLS 1.2	Yes^*
TLS 1.1	No
TLS 1.0	No
SSL 3	No
SSL 2	No
(*) Experimental: Server negotiated using No-SNI

Cipher Suites
# TLS 1.3 (suites in server-preferred order)
TLS_AES_128_GCM_SHA256 (`0x1301`) ECDH secp256r1 (eq. 3072 bits RSA) FS	128
TLS_AES_256_GCM_SHA384 (`0x1302`) ECDH secp256r1 (eq. 3072 bits RSA) FS	256
# TLS 1.2 (suites in server-preferred order)
TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 (`0xc02b`) ECDH secp256r1 (eq. 3072 bits RSA) FS	128
TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384 (`0xc02c`) ECDH secp256r1 (eq. 3072 bits RSA) FS	256

Handshake Simulation
Android 4.4.2	EC 256 (SHA256)	TLS 1.2	TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 ECDH secp256r1 FS
Android 5.0.0	EC 256 (SHA256)	TLS 1.2	TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 ECDH secp256r1 FS
Android 6.0	EC 256 (SHA256)	TLS 1.2	TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 ECDH secp256r1 FS
Android 7.0	EC 256 (SHA256)	TLS 1.2	TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 ECDH secp256r1 FS
Android 8.0	EC 256 (SHA256)	TLS 1.2	TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 ECDH secp256r1 FS
Android 8.1	-	TLS 1.3	TLS_AES_128_GCM_SHA256 ECDH secp256r1 FS
Android 9.0	-	TLS 1.3	TLS_AES_128_GCM_SHA256 ECDH secp256r1 FS
BingPreview Jan 2015	EC 256 (SHA256)	TLS 1.2	TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 ECDH secp256r1 FS
Chrome 49 / XP SP3	Server sent fatal alert: handshake_failure
Chrome 69 / Win 7 R	EC 256 (SHA256)	TLS 1.2	TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 ECDH secp256r1 FS
Chrome 70 / Win 10	-	TLS 1.3	TLS_AES_128_GCM_SHA256 ECDH secp256r1 FS
Chrome 80 / Win 10 R	-	TLS 1.3	TLS_AES_128_GCM_SHA256 ECDH secp256r1 FS
Firefox 31.3.0 ESR / Win 7	EC 256 (SHA256)	TLS 1.2	TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 ECDH secp256r1 FS
Firefox 47 / Win 7 R	EC 256 (SHA256)	TLS 1.2	TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 ECDH secp256r1 FS
Firefox 49 / XP SP3	EC 256 (SHA256)	TLS 1.2	TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 ECDH secp256r1 FS
Firefox 62 / Win 7 R	EC 256 (SHA256)	TLS 1.2	TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 ECDH secp256r1 FS
Firefox 73 / Win 10 R	-	TLS 1.3	TLS_AES_128_GCM_SHA256 ECDH secp256r1 FS
Googlebot Feb 2018	EC 256 (SHA256)	TLS 1.2	TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 ECDH secp256r1 FS
IE 11 / Win 7 R	EC 256 (SHA256)	TLS 1.2	TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 ECDH secp256r1 FS
IE 11 / Win 8.1 R	EC 256 (SHA256)	TLS 1.2	TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 ECDH secp256r1 FS
IE 11 / Win Phone 8.1 R	EC 256 (SHA256)	TLS 1.2	TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 ECDH secp256r1 FS
IE 11 / Win Phone 8.1 Update R	EC 256 (SHA256)	TLS 1.2	TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 ECDH secp256r1 FS
IE 11 / Win 10 R	EC 256 (SHA256)	TLS 1.2	TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 ECDH secp256r1 FS
Edge 15 / Win 10 R	EC 256 (SHA256)	TLS 1.2	TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 ECDH secp256r1 FS
Edge 16 / Win 10 R	EC 256 (SHA256)	TLS 1.2	TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 ECDH secp256r1 FS
Edge 18 / Win 10 R	EC 256 (SHA256)	TLS 1.2	TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 ECDH secp256r1 FS
Edge 13 / Win Phone 10 R	EC 256 (SHA256)	TLS 1.2	TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 ECDH secp256r1 FS
Java 8u161	EC 256 (SHA256)	TLS 1.2	TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 ECDH secp256r1 FS
Java 11.0.3	-	TLS 1.3	TLS_AES_128_GCM_SHA256 ECDH secp256r1 FS
Java 12.0.1	-	TLS 1.3	TLS_AES_128_GCM_SHA256 ECDH secp256r1 FS
OpenSSL 1.0.1l R	EC 256 (SHA256)	TLS 1.2	TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 ECDH secp256r1 FS
OpenSSL 1.0.2s R	EC 256 (SHA256)	TLS 1.2	TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 ECDH secp256r1 FS
OpenSSL 1.1.0k R	EC 256 (SHA256)	TLS 1.2	TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 ECDH secp256r1 FS
OpenSSL 1.1.1c R	-	TLS 1.3	TLS_AES_128_GCM_SHA256 ECDH secp256r1 FS
Safari 6 / iOS 6.0.1	Server sent fatal alert: handshake_failure
Safari 7 / iOS 7.1 R	Server sent fatal alert: handshake_failure
Safari 7 / OS X 10.9 R	Server sent fatal alert: handshake_failure
Safari 8 / iOS 8.4 R	Server sent fatal alert: handshake_failure
Safari 8 / OS X 10.10 R	Server sent fatal alert: handshake_failure
Safari 9 / iOS 9 R	EC 256 (SHA256)	TLS 1.2	TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 ECDH secp256r1 FS
Safari 9 / OS X 10.11 R	EC 256 (SHA256)	TLS 1.2	TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 ECDH secp256r1 FS
Safari 10 / iOS 10 R	EC 256 (SHA256)	TLS 1.2	TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 ECDH secp256r1 FS
Safari 10 / OS X 10.12 R	EC 256 (SHA256)	TLS 1.2	TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 ECDH secp256r1 FS
Safari 12.1.2 / MacOS 10.14.6 Beta R	-	TLS 1.3	TLS_AES_128_GCM_SHA256 ECDH secp256r1 FS
Safari 12.1.1 / iOS 12.3.1 R	-	TLS 1.3	TLS_AES_128_GCM_SHA256 ECDH secp256r1 FS
Apple ATS 9 / iOS 9 R	EC 256 (SHA256)	TLS 1.2	TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 ECDH secp256r1 FS
Yahoo Slurp Jan 2015	EC 256 (SHA256)	TLS 1.2	TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 ECDH secp256r1 FS
YandexBot Jan 2015	EC 256 (SHA256)	TLS 1.2	TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 ECDH secp256r1 FS
# Not simulated clients (Protocol mismatch)
Android 2.3.7 No SNI ²	Protocol mismatch (not simulated)
Android 4.0.4	Protocol mismatch (not simulated)
Android 4.1.1	Protocol mismatch (not simulated)
Android 4.2.2	Protocol mismatch (not simulated)
Android 4.3	Protocol mismatch (not simulated)
Baidu Jan 2015	Protocol mismatch (not simulated)
IE 6 / XP No FS ¹ No SNI ²	Protocol mismatch (not simulated)
IE 7 / Vista	Protocol mismatch (not simulated)
IE 8 / XP No FS ¹ No SNI ²	Protocol mismatch (not simulated)
IE 8-10 / Win 7 R	Protocol mismatch (not simulated)
IE 10 / Win Phone 8.0	Protocol mismatch (not simulated)
Java 6u45 No SNI ²	Protocol mismatch (not simulated)
Java 7u25	Protocol mismatch (not simulated)
OpenSSL 0.9.8y	Protocol mismatch (not simulated)
Safari 5.1.9 / OS X 10.6.8	Protocol mismatch (not simulated)
Safari 6.0.4 / OS X 10.8.4 R	Protocol mismatch (not simulated)
Click here to expand
(1) Clients that do not support Forward Secrecy (FS) are excluded when determining support for it.
(2) No support for virtual SSL hosting (SNI). Connects to the default site if the server uses SNI.
(3) Only first connection attempt simulated. Browsers sometimes retry with a lower protocol version.
(R) Denotes a reference browser or client, with which we expect better effective security.
(All) We use defaults, but some platforms do not use their best protocols and features (e.g., Java 6 & 7, older IE).
(All) Certificate trust is not checked in handshake simulation, we only perform TLS handshake.

Protocol Details
Secure Renegotiation	Supported
Secure Client-Initiated Renegotiation	Yes
Insecure Client-Initiated Renegotiation	No
BEAST attack	Mitigated server-side (more info)
POODLE (SSLv3)	No, SSL 3 not supported (more info)
POODLE (TLS)	No (more info)
Zombie POODLE	No (more info)
GOLDENDOODLE	No (more info)
OpenSSL 0-Length	No (more info)
Sleeping POODLE	No (more info)
Downgrade attack prevention	Yes, TLS_FALLBACK_SCSV supported (more info)
SSL/TLS compression	No
RC4	No
Heartbeat (extension)	No
Heartbleed (vulnerability)	No (more info)
Ticketbleed (vulnerability)	No (more info)
OpenSSL CCS vuln. (CVE-2014-0224)	No (more info)
OpenSSL Padding Oracle vuln. (CVE-2016-2107)	No (more info)
ROBOT (vulnerability)	No (more info)
Forward Secrecy	Yes (with most browsers) ROBUST (more info)
ALPN	No
NPN	No
Session resumption (caching)	Yes
Session resumption (tickets)	No
OCSP stapling	No
Strict Transport Security (HSTS)	Yes max-age=16070400; includeSubDomains
HSTS Preloading	Not in: Chrome Edge Firefox IE
Public Key Pinning (HPKP)	No (more info)
Public Key Pinning Report-Only	No
Public Key Pinning (Static)	No (more info)
Long handshake intolerance	No
TLS extension intolerance	No
TLS version intolerance	No
Incorrect SNI alerts	No
Uses common DH primes	No, DHE suites not supported
DH public server param (Ys) reuse	No, DHE suites not supported
ECDH public server param reuse	No
Supported Named Groups	secp256r1, x25519, secp384r1 (server preferred order)
SSL 2 handshake compatibility	Yes
0-RTT enabled	No

HTTP Requests

1 https://www.cezesco.cz/ (HTTP/1.1 200 OK)
1
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Miscellaneous
Test date	Wed, 05 Nov 2025 20:39:04 UTC
Test duration	80.403 seconds
HTTP status code	200
HTTP server signature	-
Server hostname	cez-esco.com

SSL Report v2.4.1

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