I have a Django website running Nginx on DigitalOcean. Now I have a certificate from Comodo. I have 4 files. AAACertificateServices.crt SectigoRSADomainValidationSecureServerCA.crt USERTrustRSAAAACA.crt mydomain.crt How do I combine these files and what do I need to do next? Because I get the error message: [emerg] 113128#113128: SSL_CTX_use_PrivateKey("/var/www/ssl/mydomain.key") failed (SSL: error:05800074:x509 certificate routines::key values mismatch)

Combine Comodo SSL certificate

I have a Django website running Nginx on DigitalOcean. Now I have a certificate from Comodo. I have 4 files.

AAACertificateServices.crt
SectigoRSADomainValidationSecureServerCA.crt
USERTrustRSAAAACA.crt
mydomain.crt How do I combine these files and what do I need to do next? Because I get the error message: [emerg] 113128#113128: SSL_CTX_use_PrivateKey("/var/www/ssl/mydomain.key") failed (SSL: error:05800074:x509 certificate routines::key values mismatch)