Within the last 2 weeks or so I get this error repeatedly when accessing secure sites that i used to be able to access with no issues. I use a private VPN and 2 factor authentication. Sometimes stopping the VPN momentarily fixes this, but for other sites, it's no go. This isn't an SSL or SEC error and a search on help forum didn't provide an answer.
radi.stoyanov said Turns out the option DNS over HTTPS is what caused the problem.
jamesafuf123 said https://support.mozilla.org/en-US/questions/1264659#answer-1237475 my ISP was blocking sites like that
cor-el said This usually means that Firefox wasn't able to find a cipher suites to use to connect to this server and reached the end of the list. There can be two possibilities: one is that the server is outdated and doesn't support modern cipher suites, another might be that the server only supports a few cipher suites and Firefox doesn't support any of these.
You can check your browser and possibly compare this with the server setup.