I also use Virtualmin on Centos 7 and I checked the SSL certificate on different webpages. I also got the same “error msg” but I wonder if this is not only a “false positive” and the “real message hidden behind” is that some people and companies selling commersial SSL certificates dont like the free SSL certificates so much.
What does the error message from Qualsys SSL Lab actually mean from a technical and security point of view? (I dont know, but I do not believe in everything I find on Internet.)
Quote from “error msg”:
Revocation status Validation error
OCSP ERROR: Exception: connect timed out [http://r3.o.lencr.org]
DNS CAA No (more info)
Edit:
While checking out the link r3.o.lencer.org webbrowser came up with a warning against “dangerous site”.