we have an odd issue where a java app using JDBC which has been working fine has suddenly started disconnecting after we setup replication from the database it was connecting to ( which is now the primary in a replicating pair ) with errors such as the following... CLIENT SIDE: DBNAME/logs/20210815-200601.20966.log:SessionManagerImpl WARN 20210816-00:01:00.252 - A session lost connection with the database. Disabling all sessions SERVER SIDE: 2021-08-16 01:48:27 BST FATAL: unsupported frontend protocol 1234.5680: server supports 1.0 to 3.0 ( these are different times but you get the idea ) I appreciate this seems like a JDBC driver issue but everything has been fine and we observe the errors only once we setup replication. could there be some issue with streaming / WAL replication that could be causing this ? we are running 9.6 by the way thanks.
