[ale] I'm totally stumped with an ssl connection error

[Jim Lynch]

I help maintain a site to support the Georgia Amateur Radio Emergency 
Service.  Last week it started tossing an ssl connection error, 
ERR_SSL_PROTOCOL_ERROR after having run with (almost) no issues for 
months.  I'm running apache on Ubuntu server.  It's a virtual host along 
side of another ARRL site.  I'm forcing it to use SSL via

RedirectPermanent / https://gaares.org/

In the apache2 configuration file.  I was running with a certificate 
from China, like Wofat or something but it was failing with FF, so I got 
a Comodo cert and installed it, however the error started happening a 
few days before I did that.  I thought maybe a new cert might help but 
it doesn't.

Here's the rub.  I have 3 computers running Linux, two with Mint, one 
with Centos.  I also have Windows 10 running in a VM.  All the Linux 
boxes work fine with Chrome and FF.  Edge works fine on W10. My LG phone 
fails.  My friend has tested IE 11, Edge and Linux Chrome, they all 
fail.  Linux FF works fine for him as does Safari on his phone.

There are a few others that have reported the same issue.

I have restarted Apache, rebooted the server and tested the DNS, the SSL 
and looked at blacklists using various tools I've found on the web.  
Everything I do tells me the site is healthy.  I've exhausted my 
knowledge and am appealing for help.

Google gives me page after page of how to fix it by tinkering with the 
browser, but I can't figure out how multiple people can have browser 
issues at the same time.

Any help would be much appreciated.
Jim.