On Feb 25, 2020, at 12:43 PM, Danner, Mearl <jmdanner@samford.edu> wrote:
Just got this from a wireless lan list:
"We has been struggling with a recent patch from Ubuntu that broke encrypted connections between some of our internal servers.
Long story short: Ubuntu now uses GNU-TLS and the latest security patch has removed support for SHA-1. Error messages in Ubuntu or in LDAP were not explicit enough to make it obvious.
SHA-1 has been deprecated for years.
Some of you may face this issue between RADIUS and LDAP (still used quite a bit for 802.1X). This issue will most likely affect internally issued infrastructure certificates!
Fix: Do not patch GNU-TLS (is this a good idea?) or recreate your ROOT CA to support SHA-2 family"
You should use SHA-2 for all of your certs. Everyone should have switched to that years ago. :( Alan DeKok.