I installed 2.4.27, along with the latest openssl. no config was changed, but my server isn't serving.
Thanks, I know that I didn't give much info, I was just hoping for some hint.
But I finally got all working again: I found I had shut down http/https when installing webmin. I suspected that early on, and thought I had turned them on again; but I hadn't done it properly and didn't discover that until this morning.