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nixCraft 🐧 on Twitter: "Want to check TLS/SSL certificate expiration date from #Linux, macOS or UNIX command line? Try: DOM="your-www-domain-name-here" PORT="443" echo | openssl s_client -servername "$DOM" -connect "$DOM:$PORT" | openssl x509 -
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Scanning TLS/SSL configuration with SSLScan - Web Penetration Testing with Kali Linux - Third Edition [Book]
Client and Server Authentication enablement required for Tunnel SSL Certificate (2960360) | VMware KB
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HTTP Server Test Fails with SSL Error: OpenSSL SSL_connect: SSL_ERROR_SYSCALL - ThousandEyes Documentation
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