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 autoconfig.casoar.o2switch.net, autodiscover.casoar.o2switch.net, casoar.o2switch.net, cpanel.casoar.o2switch.net, cpcalendars.casoar.o2switch.net, cpcontacts.casoar.o2switch.net, ipv6.casoar.o2switch.net, mail.casoar.o2switch.net, mail.robotcop.o2switch.net, not for 109-234-166-60.reverse.odns.fr

Open Cached · just now
75/100 SECURITY SCORE

Certificate Information

Subject
CN=autoconfig.casoar.o2switch.net
Issuer
C=US, O=Let's Encrypt, CN=R12
Valid From
October 22, 2025
Valid Until
January 20, 2026 45 days
Public Key
RSA 2048 bit Adequate
Signature Algorithm
SHA256-RSA
SHA-256 Fingerprint
34:CC:24:EB:44:34:F0:0A:BD:DF:3F:53:B0:DA:42:68:77:19:DA:2A:55:99:90:4D:8D:A3:03:87:62:41:6E:C0
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