GeoTrust/RapidSSL: Whats the meaning of the various certificate .CER files ?

ServerCertificate.cer = Certificate specifically for your domain / wildcard
CACertificate-1.cer = RapidSSL intermediate certificate
CACertificate-2.cer = GeoTrust CA Root certificate

For requesting the certificate, a .CSR and a private-key .KEY file have been created. - The CSR has been required for requesting the certificate and remains unused later. The private-key file is required for installation.

Important: it will only work when using ServerCertificate.cer together with the private-key that has been created together with the CSR that was used for ordering the SSL certificate. CSR/KEY/CER pairs need to be matching !

Example settings for correct certificate/key usage in Apache:

SSLCertificateFile /home/user/ssl/ServerCertificate.cer
SSLCertificateKeyFile /home/user/ssl/privatekey.key
SSLCertificateChainFile /home/user/ssl/CACertificate-1.cer

The file CACertificate-2.cer ist the root certificate. Usually all common servers already have this installed in their certificate CA store. Some server types, like nginx, do require installation of both CACertificate-1.cer *and* CACertificate-2.cer in correct order, hence the numbering in the file names.

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