Hello all,

After a full update from Fedora 41 to Fedora 42 all client backups are now
failing. The error is mentioned in the subject line, I've made no changes
to the rsyncd.conf or rsyncd.secrets files

Host key verification failed.

I'm not seeing the problem. I've made no changes to the user (backuppc) and
the user can successfully login to the clients using ssh as before the
update.

The previous lines are:

Running: /usr/bin/rsync_bpc --bpc-top-dir /var/lib/BackupPC/
--bpc-host-name xxxx --bpc-share-name xxxx ...
incr backup started for directory xxxx
Xfer PIDs are now 72054
This is the rsync child about to exec /usr/bin/rsync_bpc
Host key verification failed.
rsync_bpc: connection unexpectedly closed (0 bytes received so far) [Receiver]

The login itself is successful accordig to the rsyslog messages file and
although  I saw no (what appeared to me) selinux errors I turned off
selinux on the client and server and it still fails.

I'm not seeing any errors on the syslog messages file on clients or server
and the server is reporting "rsync error: unexplained error (code 255) at
io.c(226) [Receiver=3.1.3.0]".

I'm stuck and not really sure how to troubleshoot the rsync code 255 error
and I'm hoping someone else running Fedora 42 has seen, and solved, the
problem.

Regards,

John C.
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