How to generate the certificate chain for AWS Load Balancer

Question

I'm using Amazon Load Balancer with SSL configuration. The problem is I am getting an exception page. 

My SSL provider is Comodo (InstantSSL). They provide two files .crt and .ca-bundle only.

How can I generate the Certificate Chain?

Answer 1

You can cat the .crt and the .ca-bundle file together. These files will be provided by the certificate issuer

cat certfile.crt bundle.ca-bundle >> chain.crt

chain.crt should be the file you're looking for. Also, the order is important. The certificate.crt file has to be first.