I'm not at all familiar with ooklaserver, but here's a couple of links that may help you.
And last but not least, it seems @rg305 had helped someone with a ooklaserver problem here:
Unable to get https ssl certificate on 8080 and 5060 port for ookla speedtest server - #7 by samsam
And this may help as well.
How do I enable HTTPS / TLS support - #6 by razaul_mon
There are several topics here on LE that deal with ooklaservers. In the search above, just type ooklaserver and the topics will come up. 