Chaining Comodo SSL certificates in the right order for nginx

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When installing SSL certificates on a server, the order in which they are chained together is important. To do that, use this command:

cat www_example_com.crt COMODORSADomainValidationSecureServerCA.crt COMODORSAAddTrustCA.crt AddTrustExternalCARoot.crt >> ssl_bundle.crt

Then transfer the ssl_bundle.crt file to your server; update the nginx configuration and restart nginx. Finally, verify that everything is working right using one or all of the tools below: