I already have a signed certificate from comodo, with its private key in pem format. tried to import it in NAM but get error "DER length more than 4 bytes". Converted it to DER format and same error. Tried with and without the private key but seems there is no way to import this certificate (by the way its is wildcard, not assigned to a single host). Does anyone knows the exact format of the certificate to be imported in NAM?