Just grabbed to newest docker image for cardano-node 1.25.1, started up the node and I see now a lot of error messages in the log which was not there before. They look like this:
cardano-node_1 | [9ad50f8a:cardano.node.LocalErrorPolicy:Error:546] [2021-02-03 14:59:13.52 UTC] IP LocalAddress “” ErrorPolicyUnhandledApplicationException (MuxError MuxBearerClosed “<socket: 36> closed when reading data, waiting on next header True”)
If so, its probably just a change to the way the logging is done (either this is a new log message or a change in the severity level which makes it visible) and can safely be ignored.