Thank you for your post!
It doesn't look like we support the Comodo Wildcard or Comodo SAN SSL Certificates. You might check into the WildCard or SAN Certificates from Incommon or Digicert. You can find further information on the List of supported SSL certificate types and vendors for FileMaker platform.
TS Pigeon gave you the main answer that those certs are not supported in FM. A long time ago I was able to force one to work with FMS 13, but it won't work on 14 (I tried) and I assume won't on 15 (haven't personally tried it). The reason for Comodo primarily was that is was cheap... something like $5 a year. Assuming you are looking for the least expensive way to go that is supported, I've found some Thawte SSL123 from www.SSLS.com that are about $30 a year. That is about the best price I've found. See the link TSPigeon gave you on supported certificate types and let us know if you find anything cheaper.
Thank you for the help, I will look for another certificate.
I just installed a Comodo PremiumSSL Wildcard certificate on our v15 dev server that was purchased thru namecheap.com. The process for getting the cert was a pain as our D&B info was out of date, but installing was a snap. I copied the PEM and KEY files from our web box to FMS, entered the password, restarted, and was up and running.
I know the "Comodo Elite SSL Certificate EV SSL" certificate is approved, but not sure that the one you have referenced will work. But test it out and see if you get the green lock when connecting from clients. Also, note that due to how certs have to be pre-supported on iOS devices, there is possibility that you can get this to work on computers, but not FileMaker Go.
I would not recommend doing this for a production system. But for a development or test solution, I'm always game for trying unsupported configurations. Let us know well this works for you.
The cert works as you'd expect on desktop or iOS. Server shows it as a valid cert. The client connects securely.