TLS tester
SSL/TLS security testing and vulnerability scanning crawler bot
About this crawler
TLS tester is a web crawler identified by the regular-expression pattern TLS tester in the User-Agent request header. It is categorised as scanner. Use the regex above to detect, log, allow, or block TLS tester traffic in your web server, CDN edge rules, or robots.txt.
Block-rate · top 25k sites
No block-rate data for this crawler.
Technical details
- Name
- TLS tester
- Pattern
TLS tester- Tags
- scanner
- Reference
- https://github.com/testssl/testssl.sh
- Added
- 2026/04/26
- Instances
- 1 known sample(s)
Sample User-Agent strings
TLS tester from https://testssl.sh/
Block this crawler
robots.txt — disallow TLS tester:
User-agent: TLS tester
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} TLS tester [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "TLS tester") {
return 403;
}
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