Install Comodo PositiveSSL Certificate on Nginx

File used when using PositiveSSL are:

• AddTrustExternalCARoot.crt
• PositiveSSLCA2.crt
• the_domain.crt

Concatenate the certificate in reverse order.

cat the_domain.crt > the_domain.pem
cat PositiveSSLCA2.crt >> the_domain.pem
cat AddTrustExternalCARoot.crt >> the_domain.pem

Open Nginx virtual host configuration and put the the_domain.pem along with the_domain.key (not discussed here).

[--- SNIP ---]
ssl on;
ssl_certificate /path/to/the_domain.pem;
ssl_certiticate_key /path/to/the_domain.key
[--- SIP ---]

Done. Restart Nginx.

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