Every single IM client can connect to the jabberpl.org server, but KDE Telepathy can't. I always get an authentication error, but hopefully this report much more verbose:
-- GitLab Migration Automatic Message --
This bug has been migrated to freedesktop.org's GitLab instance and has been closed from further activity.
You can subscribe and participate further through the new bug through this link to our GitLab instance: https://gitlab.freedesktop.org/telepathy/telepathy-gabble/issues/285.