#check intermediate certificate

openssl verify my_interm_certificate_ssl.crt

» my_interm_certificate_ssl.crt: OK

#check verisign certificate

openssl verify -CAfile my_interm_certificate_ssl.crt my_certificate_ssl.crt

» my_certificate_ssl.crt: OK

#http://wiki.nginx.org/NginxHttpSslModule

#using a single file for Nginx SSL configuration (merging them together)

cat my_interm_certificate_ssl.crt » my_certificate_ssl.crt