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SSL Server Security Test

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Latest Tested SSL/TLS Servers


High-Tech Bridge provides you with a free API to test your SSL/TLS servers. To assure high speed of service and availability for everyone, the free API allows 20 requests in 3 minutes, 250 requests in total per 24 hours, from one IP address.

In order to prevent abuse, a protection mechanism has been set up to remove the ability to test IPs that are not related to tested domain name. As a consequence if a domain name is resolved into several IPs, a second request will be mandatory, specifying one of the IPs replied by the server along with the token issued (examples are below). However, if the tested domain name can be resolved into only one IP address, it will be immediately tested.

License notice: The API is provided for free both for private and commercial purposes. If you use the API for publicly available service (commercial or not) a link to High-Tech Bridge's Free SSL Server Test is mandatory.

API Documentation and How-To

The full version of the API documentation and how-to is available here. Below you can find a brief summary of the documentation.

API Specifications

Field Name Value
Protocol HTTPS
Request Type POST
URL https://www.htbridge.com/ssl/api/v1/check/[ustamp].html - where "ustamp" is an arbitrary UNIX time-stamp (must be an integer). Such construction is done to prevent caching on client side.

POST Data Specification

Field Name Value
domain:port must be a valid domain name, or IP address, followed by a port number. If port is not supplied, 443 is used by default.
show_test_results "false" means that test results will be hidden, "true" means that test results will be displayed in statistics.
choosen_ip IP address of tested server (if tested domain resolves to multiple addresses).
recheck "false" will use results from cache if the server has been tested within the past 24 hours, "true" will perform a new test without looking at the cache.
verbosity 1 means output will be detailed, 0 means output will be short.
token value of the token sent by the server if the tested domain is resolved into several IP addresses.

Example of Transaction Using CURL

$ curl -XPOST -d 'domain=twitter.com:443&show_test_results=true&recheck=false&verbosity=1' 'https://www.htbridge.com/ssl/api/v1/check/1451425590.html'


$ curl -XPOST -d 'domain=twitter.com:443&show_test_results=true&recheck=false&choosen_ip=' 'https://www.htbridge.com/ssl/api/v1/check/1451425590.html'

System Messages

Message Name Response
multiple_mxes Result is associative array of hostnames with list of IPs - eg. {"multiple_mxes":{"ASPMX2.GOOGLEMAIL.COM":[""],"alt2.aspmx.l.google.com":[""],"ASPMX3.GOOGLEMAIL.COM":[""]}, "token": "68j3OCZLEomtjASxKoObjZXzX7p2M7L0"}
multiple_ips Result is list of IPs - eg. {"multiple_ips":["",""], "token": "68j3OCZLEomtjASxKoObjZXzX7p2M7L0"}
error You have performed N tests in the last 3 minutes. The system is currently busy, please try again later.
error Domain name was resolved to an invalid IP address.
error Invalid IP address.
error The domain name does not exist.
error An error occured while testing server configuration, server became unreachable during the test.

Example of Server Response


About the Service

This free online service is provided and operated by High-Tech Bridge.

Aimed to enable anyone to assess how secure and reliable his or her SSL/TLS connection to a server (on any port) is, the service performs five distinct tests:
  Test for compliance with PCI DSS Requirements;
  Test for compliance with HIPAA Guidance;
  Test for compliance with NIST Guidelines;
  Test for the most recent SSL/TLS vulnerabilities and weaknesses;
  Test for insecure third-party content that may expose user’s privacy.

Might you have any suggestions on how to improve the service please contact us by email:

Scoring Methodology

- At the beginning of the test, server score is 100.
- Points are deducted when server configuration does not correspond to the PCI DSS requirements, HIPAA guidance or NIST guidelines.
- Points are also deducted when server configuration contains exploitable vulnerabilities or weaknesses that are not yet covered by PCI DSS, HIPAA or NIST.
- Points are added for every extra best practice which is not mentioned in the PCI DSS requirements, HIPAA guidance or NIST guidelines.
- Server cannot get an A+ if a misconfiguration makes it lose more than 10 points.
Grade Score
A+ Score greater than 99
A Score between 90 and 99
A- Score between 80 and 89
Grade Score
B+ Score between 70 and 79
B Score between 60 and 69
B- Score between 50 and 59
Grade Score
C+ Score between 35 and 49
C Score between 20 and 34
F Score lower than 20


Description Score
Certificate is an Extended Validation (EV) certificate +10 points
HTTP website redirects to HTTPS (Always-On SSL) +10 points
Server prefers cipher suites providing strong Perfect Forward Secrecy (PFS) +10 points
Server provides TLS_Fallback_SCSV extension +10 points
Server implements HTTP Strict Transport Security (HSTS) with long duration +10 points
Server implements HTTP Public Key Pinning (HPKP) with long duration +10 points
Server X509 certificate is prior to version 3 -5 points
Server certificate has been issued for more than 3 year period -5 points
Server certificate has not been signed with the proper algorithm -5 points
Server does not support OCSP stapling -5 points
TLSv1.1 is not supported but TLSv1.2 is -5 points
Server does not support neither P-256 nor P-384 curves -5 points
Server does not support some cipher suites required by NIST guidelines or HIPAA guidance -5 points
TLS cipher suites that are not approved by NIST guidelines or HIPAA guidance are supported -5 points
Server supports Elliptic Curves but does not support EC Point Format extension -5 points
Certificate chain is not provided -10 points
TLSv1.1 and TLSv1.2 are both not supported -10 points
Website includes insecure (HTTP) content -10 points
Server accepts client-initiated secure renegotiation -10 points
Server does not provide information about support for secure renegotiation -10 points
Certificate is untrusted or invalid -20 points
Certificate signature is not SHA2 -20 points
Certificate does not provide revocation information -20 points
SSL is supported but TLSv1.1 or TLSv1.2 are preferred -20 points
SSL/TLS cipher suites that are not approved by PCI DSS are supported -20 points
Certificate key length or DH parameter are too small (< 2048 bits or 256 bits for EC) -40 points
Server supports at least one elliptic curve whose size is below 224 bits -40 points
SSL is supported while TLSv1.1 or TLSv1.2 are not -40 points
SSL/TLS cipher suites that are not approved by PCI DSS are preferred -40 points
Server supports TLS compression which may allow CRIME attack -40 points
Server is vulnerable to CVE-2014-0224 (OpenSSL CCS flaw) -60 points
Server is vulnerable to CVE-2016-2107 (OpenSSL padding-oracle flaw) -60 points
Server is vulnerable to POODLE over TLS -60 points
Server accepts client-initiated insecure renegotiation -60 points
Server is vulnerable to Heartbleed -70 points


URL Description
Nginx Blog post for strong TLS configuration on Nginx
Apache2 Blog post for strong TLS configuration on Apache2
Lighttpd Blog post for strong TLS configuration on Lighttpd
IIS Blog post for good cipher suites configuration on IIS
Interactive SSL/TLS Security Live World Map
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Recent Tests (Continued): HTTPS, SMTPS, POP3S, IMAPS, STARTTLS, SSL VPN:

SSL/TLS Security Publications
Global companies aren't quick to patch "high" severity flaw in OpenSSL

Friday, May 27, 2016 | High-Tech Bridge Security Research

Yet another Padding Oracle flaw (CVE-2016-2107), allowing decrypting TLS traffic in a MITM attack, remains exploitable on the most popular web and email servers.

90% of SSL VPNs use insecure or outdated encryption, putting your data at risk

Tuesday, February 23, 2016 | High-Tech Bridge Security Research

In December 2015, we conducted a research on SSL/TLS encryption of the largest public email service providers that helped several large companies to improve the quality and reliability of their email servers SSL/TLS encryption.

Can you trust SSL encryption of your email provider?

Tuesday, December 1, 2015 | High-Tech Bridge Security Research

One month ago, High-Tech Bridge launched a free online PCI DSS and NIST compliant SSL test. Two weeks ago we updated the service functionality and added support of non-HTTP protocols to enable testing of SSL/TLS security and reliability of any service, such as email.

Can we trust our HTTPS connections to the largest global companies?

Wednesday, October 28, 2015 | High-Tech Bridge Security Research

Efficient and effective data encryption becomes a vital part of our daily life. We use various web applications every day to pay our bills, send and receive our emails and share private information or photos with friends on social networks.