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:
Unknown Certificate Authority - the server's certificate is not trusted
Open
Cached
·
just now
86/100
SECURITY SCORE
Certificate Information
Subject
C=NL, L=Utrecht, O=SURF B.V., CN=surfmailfilter.nl
Issuer
C=GR, O=Hellenic Academic and Research Institutions CA, CN=GEANT TLS RSA 1
Valid From
September 16, 2025
Valid Until
September 16, 2026
265 days
Public Key
RSA
2048 bit
Adequate
Signature Algorithm
SHA256-RSA
SHA-256 Fingerprint
64:E3:47:E9:15:AD:1D:93:9E:18:81:EB:A4:AD:D2:99:57:9B:52:E8:5B:A2:5B:82:79:BB:6A:E7:91:C5:FA:FE
Alternative Names
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
Basic
default-src; script-src; style-src; +7 more
default-src 'self'; script-src 'self' webstats.surf.nl *.mailplus.nl platform.twitter.com syndication.twitter.com cdn.syndication.twimg.com www.instagram.com www.google.com www.gstatic.com surfnl.containers.piwik.pro pretalx.surf.nl feedback.communicatie.surf.nl 'unsafe-inline' 'unsafe-eval' https://app.vwo.com https://d5phz18u4wuww.cloudfront.net/vis_opt.js https://dev.visualwebsiteoptimizer.com https://eu.frcapi.co; style-src 'self' 'unsafe-inline' static.mailplus.nl fonts.googleapis.com use.typekit.net p.typekit.net platform.twitter.com surfnl.containers.piwik.pro surfnl.piwik.pro https://app.vwo.com https://dev.visualwebsiteoptimizer.com https://eu.frcapi.com/; img-src http: https: surfnl.containers.piwik.pro surfnl.piwik.pro data:;; frame-src 'self' *.surf.nl openonderwijsapi.nl www.surfspace.nl surfspace.nl www.slideshare.net player.vimeo.com www.youtube.com www.youtube-nocookie.com surf.mediamission.nl platform.twitter.com syndication.twitter.com www.instagram.com www.facebook.com www.linkedin.com www.google.com https://surf.apnd.me/OWD23/program https://surf.apnd.me/ACUD23/program https://app.vwo.com *.edu.nl https://eu.frcapi.com/; child-src 'self' surf.mediamission.nl www.slideshare.net player.vimeo.com www.youtube.com www.youtube-nocookie.com surf.mediamission.nl platform.twitter.com syndication.twitter.com www.instagram.com www.facebook.com www.linkedin.com https://app.vwo.com; font-src 'self' fonts.gstatic.com surfnl.containers.piwik.pro surfnl.piwik.pro data:; connect-src 'self' surfnl.piwik.pro webstats.surf.nl surfnl.containers.piwik.pro surfnl.piwik.pro pretalx.surf.nl *.surf.nl https://app.vwo.com https://dev.visualwebsiteoptimizer.com https://eu.frcapi.com/; report-uri /report-csp-violation; upgrade-insecure-requests
X-Frame-Options
Good
SAMEORIGIN
X-Content-Type-Options
Good
nosniff
Referrer-Policy
Present
same-origin
Permissions-Policy
Missing
Not configured
Recommendations
- • Add Strict-Transport-Security header with max-age of at least 1 year
- • Improve CSP by adding more specific directives and removing 'unsafe-inline'
- • Consider adding Permissions-Policy to control browser features
CAA Records (Certificate Authority Authorization)
CAA Records
Configured
(Restricts certificate issuance)
Current Issuer
Not Authorized
(Potential misconfiguration)
Authorized CAs
CAA Issues
- • CRITICAL: Current certificate issuer 'C=GR, O=Hellenic Academic and Research Institutions CA, CN=GEANT TLS RSA 1' is NOT authorized by CAA records. Authorized CAs: harica.gr
Recommendations
- • Consider using critical flag (flags=128) for stricter CAA enforcement
- • Consider adding 'iodef' records to receive notifications about unauthorized certificate issuance attempts
- • Consider adding 'issuewild' records to control wildcard certificate issuance