DNS Gurus
Cached · just now
87/100 SECURITY SCORE

Certificate Information

Subject
CN=lime.collaboradmins.com
Issuer
C=US, O=Let's Encrypt, CN=R13
Valid From
December 23, 2025
Valid Until
March 23, 2026 80 days
Public Key
RSA 4096 bit Strong
Signature Algorithm
SHA256-RSA
SHA-256 Fingerprint
E4:69:69:E2:97:6E:95:88:39:2B:28:31:34:9A:DF:25:40:89:F2:68:AE:81:CE:2A:02:40:8E:42:34:3E:76:7D
Alternative Names
54 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
Weak
frame-ancestors
X-Frame-Options
Present
ALLOW-FROM https://support.collaboraoffice.com https://mautic.collaboraoffice.com https://www.collaboraonline.con
X-Content-Type-Options
Good
nosniff
Referrer-Policy
Good
strict-origin-when-cross-origin
Permissions-Policy
Missing
Not configured
Recommendations
  • • Add Strict-Transport-Security header with max-age of at least 1 year
  • • Significantly strengthen CSP directives
  • • 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