What are those .pem files?

Hello @sincerekamal,

The best answer should be provided by your hosting company, in this case Amazon. Anyway, from Configure an HTTPS Listener for Your Load Balancer

If you have an SSL certificate to upload, select Upload a new SSL Certificate to AWS Identity and Access Management (IAM).
Enter the name of the certificate.
In Private Key, copy and paste the contents of the private key file (PEM-encoded).
In Public Key Certificate, copy and paste the contents of the public key certificate file (PEM-encoded).
In Certificate Chain, copy and paste the contents of the certificate chain file (PEM-encoded)

So,

Private Key --------> privkey.pem
Public Key ---------> cert.pem
Certificate Chain --> chain.pem

Cheers,
sahsanu

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