So I combined all the Comodo certs in this order using the cat command: cat sub.domain.com.crt COMODORSADomainValidationSecureServerCA.crt COMODORSAAddTrustCA.crt >combined.crt Edit: I have removed the AddTrustExternalCARoot.crt in the combination process I heard it was recommended to leave it out unless you get error so I recombined without it and I am not receiving any errors.. So I am leaving it out you may add it if you choose, if you choose to add it the list looks like this: cat sub.domain.com.crt COMODORSADomainValidationSecureServerCA.crt COMODORSAAddTrustCA.crt AddTrustExternalCARoot.crt >combined.crt Once they where combined I then used the following command to make a .p12 file : openssl pkcs12 -export -in combined.crt -inkey privkey.pem -out sub.domain.com.p12 I imported the .p12 file into the "Certificate" area and I was then able to select the Comodo Cert for the WebAdmin/User Portal. Because the combined.crt contains all the authority validation certs you do not have to import them into the certificate authority area.
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