SSL/TLS authentication

Comodo/Sectigo Certificate Authority (CA)

Computers that access Travelport software and websites require access on TCP Port 80 to Comodo/Sectigo Certificate Authority (CA) for SSL/TLS Authentication. Certificate Revocation Lists (CRLs) and Online Certificate Status Protocol (OCSP) use HTTP to retrieve information from the following servers/domains related to SSL/TLS Authentication.

Important!

These entries should be whitelisted on your firewall policies and/or access control devices to ensure seamless access to our CRL services.

Domains	*.usertrust.com *.comodo.net *.comodoca.com *.sectigo.com
URL	crl.comodoca.com.cdn.cloudflare.net
Port	TCP/80

For more information about these protocols, see:

• TLS Handshake Protocol at Microsoft

• What Happens in a TLS Handshake? at Cloudflare

• OCSP and CRL access information at Sectigo