Comment # 1 on bug 1123345 from Jon Brightwell

For clarity, here's the snippet from the email with exact dates.



> TLS-SNI-01 validation is reaching end-of-life. It will stop working
temporarily on February 13th, 2019, and permanently on March 13th, 2019.
Any certificates issued before then will continue to work for 90 days
after their issuance date.