Just adding to what @_az posted....
About four months ago, LetsEncrypt removed the remaining exceptions and rolled out "unpredictable" verification to everyone. See: ACME v1/v2: Validating challenges from multiple network vantage points - #3 by cpu
Just adding to what @_az posted....
About four months ago, LetsEncrypt removed the remaining exceptions and rolled out "unpredictable" verification to everyone. See: ACME v1/v2: Validating challenges from multiple network vantage points - #3 by cpu