After a hard drive crash I had to reinstall the XMPP server and restore
its DB from backup.
Everything in the server seems to have been restored back to its state
before the crash, at least the users are there and each of them can
still connect their Gajim after accepting the new SSL cert.
But their rosters have an issue: each contact is offline with a
red-white X icon and their info says
Has errors: remote-server-not-found
How can I purge this state from the roster contacts and let the users
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