You might want to try the old way of installing the certificate. There is an entire thread on the admin console process not working.
If the same certificate installs that way please let FMI know about it As they are concerned about the admin console having errors.
Generate request via CLI.
Thanks for clarifying that - wasn't sure what you meant!
I generated a request via CLI, and then tried to install it both through the GUI and the CLI - NO DICE! Open to any other ideas anyone might have. I did get the same exact error message in the CLI as last time.
Hoping I don't have to wait until Monday to call tech support on this one.
If that is the case there might be something wrong with another part of what you are doing.
So I figured this out, and thought I should document it for others. This was my first time ever dealing with an SSL certificate so there was a big learning curve.
The certificate issued by Comodo was a .cer file which seemed to be the root of the problem.
I wrote to Comodo and they converted the .cer file into several .crt files. I honestly don't know what the additional files are for, but the one that was marked with my domain name is the one I installed and it appears to be working fine. I didn't install an intermediate certificate, but I wasn't applying for an EV certificate, so I'm guessing it wasn't needed.
Will write back here if I learn anything else useful... hopefully someone else will make use of this in the future!