Uploading an SSL certificate chain on iDRAC6

I have a Dell Poweredge R610 server with iDRAC6 enterprise (1.99). I obtained a Comodo PositiveSSL certificate which has the following files:

Root CA Certificate - AddTrustExternalCARoot.crt
Intermediate CA Certificate - COMODORSAAddTrustCA.crt
Intermediate CA Certificate - COMODORSADomainValidationSecureServerCA.crt
PositiveSSL Certificate - idrac_domain_com.crt



All the files are in PEM format, so I concatenated them in the following order:

idrac_domain_com.crt
COMODORSADomainValidationSecureServerCA.crt
COMODORSAAddTrustCA.crt
AddTrustExternalCARoot.crt

And executed the following commands to upload the key and the cert:

racadm -r -i sslkeyupload -t 1 -f private-key.txt
racadm -r -i sslcertupload -t 1 -f unified-cert.txt

But the server only sends the main certificate and leaves out the rest of the chain leading to browser errors.

I even tried combining them in the following order but it didn't work:

idrac_domain_com.crt
AddTrustExternalCARoot.crt
COMODORSAAddTrustCA.crt
COMODORSADomainValidationSecureServerCA.crt

One article suggested that the CA certs must be uploaded separately as type 2, so I even tried that but still the same problem:

racadm -r -i sslkeyupload -t 1 -f private-key.txt
racadm -r -i sslcertupload -t 2 -f ca-cert.txt
racadm -r -i sslcertupload -t 1 -f domain-cert.txt

Please help me find a solution to this.