Let's Encrypt is making changes to the certificates it issues from 11th February. This has some impact on the XMPP network.
No action required for Prosody operators. Operators of servers running ejabberd need to make sure they are running version 25.08 or later.
More details in our blog post: https://blog.prosody.im/2026-letsencrypt-changes/
RE: https://fosstodon.org/@prosodyim/116023920812720509
**Important consideration if you are running a XMPP server.**
If you are using Ejabberd you need to be at least on 25.08 or have mod_s2s_dialback enabled until you can upgrade. Otherwise your connection to other XMPP servers will fail.
Starting 11 February!