gdtopbook.comSSL Check Results
2765
days expired
TLSv1.2
ECDHE-RSA-AES128-GCM-SHA256
Default Company Ltd
2048 bits
92E47A4DBD236B20
5B:82:F6:28:0C:15:A6:06:22:D5:C3:FE:13:4B:DA:F7:0E:82:DE:E5
8B:EC:43:67:E4:E0:F5:1A:74:E5:92:1A:F5:FD:EF:7E:EF:9D:B8:CE:A4:BF:58:76:C5:02:32:47:71:9C:F5:2F
Security Score
Fair security, improvements recommended
- 立即更新已过期的证书
- 检查证书链配置，确保证书正确签发
Default Company Ltd
2765 days expired
May 31, 2018
Jun 30, 2018
Security Analysis
Secure
Secure
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Certificate History
No historical data found
SSL Security Best Practices
Automate Renewals
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Use Strong Protocols
Always prefer TLS 1.3 or 1.2. Disable older, vulnerable protocols like SSL 3.0, TLS 1.0, and TLS 1.1 on your server.
Monitor Transparency
Keep an eye on Certificate Transparency (CT) logs to ensure no unauthorized certificates are issued for your domain.
Frequently Asked Questions
Everything you need to know about gdtopbook.com's security status.
Q:When does gdtopbook.com's SSL certificate expire?
gdtopbook.com's certificate expires on June 30, 2018, which is in -2765 days.
Q:Who issued the certificate for gdtopbook.com?
It was issued by Default Company Ltd. This issuer is recognized by all major browsers.
Q:Is the connection to gdtopbook.com safe?
Warning: The certificate has expired or is invalid. Use caution when sharing sensitive data.
Q:Can I monitor this domain for free?
Yes! You can register at GuardSSL to get automatic alerts before gdtopbook.com's certificate expires, preventing any downtime.