The Wayback Machine - https://web.archive.org/web/20190123032019/https://community.letsencrypt.org/
How to stop using TLS-SNI-01 with Certbot [Client dev] (5)

Let’s Encrypt is removing support for domain validation with TLS-SNI-01. If you’re using Certbot and received an email titled “Action required: Let’s Encrypt certificate renewals”, here’s how to work around the problem. …

Action required: Let's Encrypt certificate renewals [Help] (3)

If you received an email titled “Action required: Let’s Encrypt certificate renewals”, this post is for you. Our initial email didn’t include domain names - after some feedback, we’re planning to send out a second batch…

Welcome to Let's Encrypt Community Support [Uncategorized] (2)
Renewal Error : Certbot has problem setting up the virtual environment [Help] (2)
ECDSA Root and Intermediates ( 2 ) [ISRG/Organizational] (27)
Concerns about: disable the “reuse valid authorizations” [Client dev] (2)
Candidate second email [Site Feedback] (18)
Permission Denied [Help] (5)
Certbot has problem setting up the virtual environment [Help] (7)
Can get certificates using OPNsense, HAProxy and Let's Encrypt [Issuance Tech] (4)
Recreate SSL Certificate after Server re built [Help] (8)
February 13, 2019: End-of-Life for All TLS-SNI-01 Validation Support [API Announcements] (3)
Posh-ACME 3.2.0 Release [Client dev] (1)
Error finalizing order :: too many certificates already issued for exact set of domains [Help] (7)
Here's how to resolve the "Action required" / TLS-SNI-01 issue for Apache plugin users [Help] (7)
Invalid response ".well-known" ( 2 ) [Help] (28)
Inconsistency detected by ld.so: dl-open.c: 689: _dl_open: Assertion `_dl_debug_initialize (0, args.nsid)->r_state == RT_CONSISTENT' failed! [Help] (13)
iOS clients problems with the certificate [Server] (11)
Configure a subdomain [Help] (4)
Very old server, is there a manual way that doesn't require any installs on server? [Help] (4)
Cannot create wildcard certificates [Help] (10)
TLS-SNI-01 validation is reaching end-of-life on Windows Server [Help] (2)
Certificate not renewing on a cloned vm [Help] (2)
Certbot get certificate for webroot fails [Help] (3)
Google, Opera and Explorer https malfunction [Help] (20)
Do not certificate for both www and without www [Help] (13)
How to fix TLS-SNI deprecation [Help] (2)
Error " 'utf-8' codec can't decode byte 0xe2 in position 120: invalid continuation byte." [Help] (13)
Common name in certificate different from subdomain [Help] (8)
Action required: Let's Encrypt certificate renewals [Help] (9)