Due to a series of events within the Freenode organization that ran the IRC servers used for the #ardour channel, we are moving the channel to the libera.chat IRC network instead.
If you use an IRC client, then point it at irc.libera.chat (use port 6697 with TLS enabled, or port 6667 for plain text) and connect to the #ardour channel there. There is a bridge between Matrix and IRC that can also be used.
We have also set up a redirect https://ardour.org/chat that will always point to the current “chat” system in use (even if that were to change entirely). You can click on this in any web browser.
We are leaving the #ardour channel on Freenode in place for the time being, because it is directly referenced by Ardour releases before 6.7. But please be aware that the channel will only be lightly monitored in the future.