When trying to use a certificate issued by Letsencrypt to encrypt SST traffic an error occours which makes SST unable to continue and therefor breaks the cluster. The configuration is working with self signed certificates. It is a 2 node Cluster.
Letsencrypt is working to encrypt client connections.
The issue according to the logs "WSREP: Handshake failed: tlsv1 alert unknown ca"
shortened logs are attached
the config of second node is also attached (without username and passwort of BackupUser)