hi - the email came through January 27th at 4:34pm MST - several says AFTER i put in the new switch.
it looks like the email was sent shortly after the renewal (below)
SSL Server Test: sfinehomes.com (Powered by Qualys SSL Labs)
Valid from Sun, 27 Jan 2019 04:04:42 UTC
Valid until Sat, 27 Apr 2019 04:04:42 UTC (expires in 2 months and 29 days)
Hello,
Action may be required to prevent your Let's Encrypt certificate renewals
from breaking.
If you already received a similar e-mail, this one contains updated
information.
Your Let's Encrypt client used ACME TLS-SNI-01 domain validation to issue
a certificate in the past 60 days. Below is a list of names and IP
addresses validated (max of one per account):
sfinehomes.com (162.216.114.36) on 2018-11-25
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.
You need to update your ACME client to use an alternative validation
method (HTTP-01, DNS-01 or TLS-ALPN-01) before this date or your
certificate renewals will break and existing certificates will start to
expire.
Our staging environment already has TLS-SNI-01 disabled, so if you'd like
to test whether your system will work after February 13, you can run
against staging: Staging Environment - Let's Encrypt
If you're a Certbot user, you can find more information here:
Our forum has many threads on this topic. Please search to see if your
question has been answered, then open a new thread if it has not:
https://community.letsencrypt.org/
For more information about the TLS-SNI-01 end-of-life please see our API
announcement:
Thank you,
Let's Encrypt Staff