SSL Server Test: server.gromathic.cz (Powered by Qualys SSL Labs)

SSL Report: server.gromathic.cz (176.74.130.11)

Assessed on: Sun, 11 May 2025 17:37:32 UTC | Clear cache

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Summary

Overall Rating

If trust issues are ignored: B

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 server's certificate is not trusted, see below for details.

Certificate uses an insecure signature. Upgrade to SHA2 to avoid browser warnings. MORE INFO »

This server's certificate is not trusted by major browsers. MORE INFO »

This server does not support Forward Secrecy with the reference browsers. Grade capped to B. MORE INFO »

This server does not support Authenticated encryption (AEAD) cipher suites. Grade capped to B. MORE INFO »

This server's certificate chain is incomplete. Grade capped to B.

This server supports TLS 1.1. Grade capped to B. MORE INFO »

Certificate #1: RSA 2048 bits (SHA1withRSA)

Server Key and Certificate #1
Subject	server.gromathic.cz Fingerprint SHA256: c3f1eb2479c62dc2dd175b5552023565918e2fc4ba32e56876ce4e2abdab858c Pin SHA256: vJxr3ynCiHwZmLw/PmkIYMs71xAwbtNZ81MBwz1oeos=
Common names	server.gromathic.cz
Alternative names	gromathic.cz server.gromathic.cz autodiscover.gromathic.cz sbssrv.gromathic.local
Serial Number	10a2ecba000200000038
Valid from	Wed, 18 Sep 2024 14:09:30 UTC
Valid until	Fri, 18 Sep 2026 14:09:30 UTC (expires in 1 year and 4 months)
Key	RSA 2048 bits (e 65537)
Weak key (Debian)	No
Issuer	gromathic-SBSSRV-CA AIA: ldap:///CN=gromathic-SBSSRV-CA,CN=AIA,CN=Public%20Key%20Services,CN=Services,CN=Configuration,DC=gromathic,DC=local?cACertificate?base?objectClass=certificationAuthority AIA: http://sbssrv.gromathic.local/CertEnroll/SBSSRV.gromathic.local_gromathic-SBSSRV-CA(2).crt
Signature algorithm	SHA1withRSA INSECURE
Extended Validation	No
Certificate Transparency	No
OCSP Must Staple	No
Revocation information	None
DNS CAA	No (more info)
Trusted	No NOT TRUSTED (Why?) Mozilla Apple Android Java Windows

Additional Certificates (if supplied)
Certificates provided	1 (1629 bytes)
Chain issues	Incomplete

Certification Paths


No trust paths available Issuer unknown, or intermediate certificate(s) missing.
No trust paths available Issuer unknown, or intermediate certificate(s) missing.
No trust paths available Issuer unknown, or intermediate certificate(s) missing.
No trust paths available Issuer unknown, or intermediate certificate(s) missing.
No trust paths available Issuer unknown, or intermediate certificate(s) missing.

Click here to expand

Configuration

Protocols
TLS 1.3	No
TLS 1.2	Yes
TLS 1.1	Yes
TLS 1.0	No
SSL 3	No
SSL 2	No

Cipher Suites
# TLS 1.2 (suites in server-preferred order)
TLS_RSA_WITH_AES_128_CBC_SHA (`0x2f`) WEAK	128
TLS_RSA_WITH_AES_256_CBC_SHA (`0x35`) WEAK	256
TLS_RSA_WITH_3DES_EDE_CBC_SHA (`0xa`) WEAK	112
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (`0xc013`) ECDH secp256r1 (eq. 3072 bits RSA) FS WEAK	128
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (`0xc014`) ECDH secp256r1 (eq. 3072 bits RSA) FS WEAK	256
# TLS 1.1 (suites in server-preferred order)
TLS_RSA_WITH_AES_128_CBC_SHA (`0x2f`) WEAK	128
TLS_RSA_WITH_AES_256_CBC_SHA (`0x35`) WEAK	256
TLS_RSA_WITH_3DES_EDE_CBC_SHA (`0xa`) WEAK	112
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (`0xc013`) ECDH secp256r1 (eq. 3072 bits RSA) FS WEAK	128
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (`0xc014`) ECDH secp256r1 (eq. 3072 bits RSA) FS WEAK	256

Handshake Simulation
Android 4.4.2	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
Android 5.0.0	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
Android 6.0	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
Android 7.0	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
Android 8.0	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
Android 8.1	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
Android 9.0	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
BingPreview Jan 2015	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
Chrome 49 / XP SP3	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
Chrome 69 / Win 7 R	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
Chrome 70 / Win 10	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
Chrome 80 / Win 10 R	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
Firefox 31.3.0 ESR / Win 7	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
Firefox 47 / Win 7 R	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
Firefox 49 / XP SP3	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
Firefox 62 / Win 7 R	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
Firefox 73 / Win 10 R	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
Googlebot Feb 2018	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
IE 11 / Win 7 R	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
IE 11 / Win 8.1 R	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
IE 11 / Win Phone 8.1 R	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
IE 11 / Win Phone 8.1 Update R	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
IE 11 / Win 10 R	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
Edge 15 / Win 10 R	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
Edge 16 / Win 10 R	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
Edge 18 / Win 10 R	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
Edge 13 / Win Phone 10 R	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
Java 8u161	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
Java 11.0.3	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
Java 12.0.1	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
OpenSSL 1.0.1l R	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
OpenSSL 1.0.2s R	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
OpenSSL 1.1.0k R	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
OpenSSL 1.1.1c R	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
Safari 6 / iOS 6.0.1	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
Safari 7 / iOS 7.1 R	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
Safari 7 / OS X 10.9 R	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
Safari 8 / iOS 8.4 R	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
Safari 8 / OS X 10.10 R	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
Safari 9 / iOS 9 R	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
Safari 9 / OS X 10.11 R	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
Safari 10 / iOS 10 R	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
Safari 10 / OS X 10.12 R	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
Safari 12.1.2 / MacOS 10.14.6 Beta R	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
Safari 12.1.1 / iOS 12.3.1 R	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
Apple ATS 9 / iOS 9 R	Client requires SHA2 certificate signatures RSA 2048 (SHA1) \| TLS 1.2 \| TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA \| ECDH secp256r1
Yahoo Slurp Jan 2015	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No FS
YandexBot Jan 2015	RSA 2048 (SHA1)	TLS 1.2	TLS_RSA_WITH_AES_128_CBC_SHA No 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	No
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) TLS 1.2 : `0x002f`
GOLDENDOODLE	No (more info) TLS 1.2 : `0x002f`
OpenSSL 0-Length	No (more info) TLS 1.2 : `0x002f`
Sleeping POODLE	No (more info) TLS 1.2 : `0x002f`
Downgrade attack prevention	No, TLS_FALLBACK_SCSV not 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	With some browsers (more info)
ALPN	No
NPN	No
Session resumption (caching)	No (IDs assigned but not accepted)
Session resumption (tickets)	No
OCSP stapling	No
Strict Transport Security (HSTS)	No
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	Yes
Supported Named Groups	secp256r1, secp384r1, secp521r1 (server preferred order)
SSL 2 handshake compatibility	Yes

HTTP Requests

1 https://server.gromathic.cz/ (HTTP/1.1 302 Found)
1
	Content-Type	text/html; charset=utf-8
	Location	HTTPS://server.gromathic.cz/remote
	Server	Microsoft-IIS/7.0
	X-Powered-By	ASP.NET
	Date	Sun, 11 May 2025 17:46:03 GMT
	Connection	close
	Content-Length	151

2 https://server.gromathic.cz/remote (HTTP/1.1 301 Moved Permanently)
2
	Content-Type	text/html; charset=UTF-8
	Location	https://server.gromathic.cz/remote/
	Server	Microsoft-IIS/7.0
	X-Powered-By	ASP.NET
	Date	Sun, 11 May 2025 17:46:03 GMT
	Connection	close
	Content-Length	175

3 https://server.gromathic.cz/remote/ (HTTP/1.1 302 Found)
3
	Cache-Control	private
	Content-Type	text/html; charset=utf-8
	Location	/Remote/logon.aspx?ReturnUrl=%2fremote%2fdefault.aspx
	Server	Microsoft-IIS/7.0
	X-AspNet-Version	2.0.50727
	X-Powered-By	ASP.NET
	Date	Sun, 11 May 2025 17:46:05 GMT
	Connection	close
	Content-Length	182

4 https://server.gromathic.cz/Remote/logon.aspx?ReturnUrl=%2fremote%2fdefault.aspx (HTTP/1.1 200 OK)
4
	Cache-Control	no-cache
	Pragma	no-cache
	Content-Type	text/html; charset=utf-8
	Expires	-1
	Server	Microsoft-IIS/7.0
	X-AspNet-Version	2.0.50727
	X-Powered-By	ASP.NET
	Date	Sun, 11 May 2025 17:46:07 GMT
	Connection	close
	Content-Length	8968

Miscellaneous
Test date	Sun, 11 May 2025 17:34:21 UTC
Test duration	191.226 seconds
HTTP status code	200
HTTP server signature	Microsoft-IIS/7.0
Server hostname	server.gromathic.cz

Why is my certificate not trusted?

There are many reasons why a certificate may not be trusted. The exact problem is indicated on the report card in bright red. The problems fall into three categories:

Invalid certificate
Invalid configuration
Unknown Certificate Authority

1. Invalid certificate

A certificate is invalid if:

It is used before its activation date
It is used after its expiry date
Certificate hostnames don't match the site hostname
It has been revoked
It has insecure signature
It has been blacklisted

2. Invalid configuration

In some cases, the certificate chain does not contain all the necessary certificates to connect the web server certificate to one of the root certificates in our trust store. Less commonly, one of the certificates in the chain (other than the web server certificate) will have expired, and that invalidates the entire chain.

3. Unknown Certificate Authority

In order for trust to be established, we must have the root certificate of the signing Certificate Authority in our trust store. SSL Labs does not maintain its own trust store; instead we use the store maintained by Mozilla.

If we mark a web site as not trusted, that means that the average web user's browser will not trust it either. For certain special groups of users, such web sites can still be secure. For example, if you can securely verify that a self-signed web site is operated by a person you trust, then you can trust that self-signed web site too. Or, if you work for an organisation that manages its own trust, and you have their own root certificate already embedded in your browser. Such special cases do not work for the general public, however, and this is what we indicate on our report card.

4. Interoperability issues

In some rare cases trust cannot be established because of interoperability issues between our code and the code or configuration running on the server. We manually review such cases, but if you encounter such an issue please feel free to contact us. Such problems are very difficult to troubleshoot and you may be able to provide us with information that might help us determine the root cause.

SSL Report v2.3.1

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