Upgrade latest 1.X to 2.1.12, cannot access webUI with FF anymore using SSL

I use self-signed cert, have been since initial installation and still use same cert after upgrade to 2.1.12. I cannot access the webUI after reboot to complete update with FF in OSX or WIndows. Safari and IE work no problem.

I have changed settings in FF since issue arose in version 39 for logjam attack (https://scottontechnology.com/…e-firefox-against-logjam/) and this makes no difference. I have no issue with any LAN sites using self-signed certs. I have also created a new cert and still am not prompted to allow exception. What has changed?

This post helped:

http://superuser.com/a/918263

I had read that thread on SU previously but did not make it all the way down the page. For some reason I do not recall security.tls.version.max was user set to 1 in FF. Changed it back to 3 and I am now getting normal cert exception page for self-signed cert in omv (tls 1.2).

Strangely other LAN sites with self-signed certs are using the same version of tls and were never presented with the same error. All sites at least 2048bit RSA as well. Only after upgrading to 2.1.12 did this occur.