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 *.internal.office365.us, *.office365.us, *.outlook.office365.us, attachments.office365-net.us, attachments-dod.office365-net.us, bookings.office365.us, delve.office365.us, edge.outlook.office365.us, img.delve.office365.us, not for webmail.percsolutions.com

Cached · just now
73/100 SECURITY SCORE

Certificate Information

Subject
C=US, ST=Washington, L=Redmond, O=Microsoft Corporation, CN=office365.us
Issuer
C=US, O=DigiCert Inc, CN=DigiCert Cloud Services CA-1
Valid From
August 08, 2025
Valid Until
August 07, 2026 198 days
Public Key
RSA 2048 bit Adequate
Signature Algorithm
SHA256-RSA
SHA-256 Fingerprint
4F:27:B6:97:4C:FF:92:D7:70:B6:9E:BC:E7:99:F5:93:30:8D:95:77:31:46:FF:A7:6B:F9:4F:31:CD:16:AA:37
Alternative Names
14 domains

Security Configuration

TLS Protocols
TLS 1.2
Forward Secrecy
Limited (Check cipher configuration)
Warnings
  • • TLS 1.3 is not supported (recommended)

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