DNS Gurus

SSL Verification Bypassed

The server's SSL certificate could not be verified. The analysis was completed using insecure mode. Data may be less reliable.

Reason:

Hostname Mismatch - certificate is issued for s3-ap-northeast-1.amazonaws.com, *.s3-ap-northeast-1.amazonaws.com, s3.ap-northeast-1.amazonaws.com, *.s3.ap-northeast-1.amazonaws.com, s3.dualstack.ap-northeast-1.amazonaws.com, *.s3.dualstack.ap-northeast-1.amazonaws.com, *.s3.amazonaws.com, *.s3-control.ap-northeast-1.amazonaws.com, s3-control.ap-northeast-1.amazonaws.com, not for s3-r-w.ap-northeast-1.amazonaws.com

Open Cached · just now
75/100 SECURITY SCORE

Certificate Information

Subject
CN=*.s3-ap-northeast-1.amazonaws.com
Issuer
C=US, O=Amazon, CN=Amazon RSA 2048 M01
Valid From
June 27, 2025
Valid Until
June 18, 2026 197 days
Public Key
RSA 2048 bit Adequate
Signature Algorithm
SHA256-RSA
SHA-256 Fingerprint
DE:E8:6E:69:B9:F8:D4:D4:89:74:E8:2C:87:AD:FE:1C:74:2C:23:EF:4A:B1:A4:0E:7A:BE:6B:4D:AE:CA:E8:0F
Alternative Names
15 domains

Security Configuration

TLS Protocols
TLS 1.2 TLS 1.3
Forward Secrecy
Supported (Modern clients use PFS)

HTTP Security Headers

Status
Strict-Transport-Security
Missing
Not configured
Content-Security-Policy
Missing
Not configured
X-Frame-Options
Missing
Not configured
X-Content-Type-Options
Missing
Not configured
Referrer-Policy
Missing
Not configured
Permissions-Policy
Missing
Not configured
Recommendations
  • • Add Strict-Transport-Security header with max-age of at least 1 year
  • • Add Content-Security-Policy header to prevent XSS attacks
  • • Add X-Frame-Options: DENY or SAMEORIGIN to prevent clickjacking
  • • Add X-Content-Type-Options: nosniff
  • • Add Referrer-Policy header (recommended: strict-origin-when-cross-origin)
  • • Consider adding Permissions-Policy to control browser features

CAA Records (Certificate Authority Authorization)

CAA Records
Not Configured (Any CA can issue certificates)
CAA Issues
  • • No CAA records configured - any CA can issue certificates
Recommendations
  • • Implement CAA records to restrict which CAs can issue certificates for your domain
  • • This adds an extra layer of security against unauthorized certificate issuance
  • • Example: Add CAA record 'example.com. CAA 0 issue "letsencrypt.org"'
  • • Consider adding 'iodef' record to receive security incident reports