I am using AKKA classic remoting due to a legacy application with no intention to upgrade to using typed/artery. On the 2.6.10 version we have recently been getting the following message in the logs
a.r.EndpointReader:90 - Discarding inbound message to [unknown] in read-only association to [akka.tcp://actorSystem@{{valid url address}}:{{valid port}}]. If this happens often you may consider using akka.remote.use-passive-connections=off or use Artery TCP.
Can someone explain why this log line is recently coming out? We have only just noticed it but it could be due to an upgrade from 2.5.25 to 2.6.10, but I don't understand what could be causing this line to come out. I am nervous to use the suggested property without understanding why it is failing in the first place when it hasnt been for years.
Extra info: The cluster is set up with 2 nodes where just one of the nodes is outputting this message. It is happening when sending a message directly to one of the nodes (message is output on either the sender node or the receiver node - but more generally it is the receiver node).
