regiskuckaertz opened a new issue, #1910:
URL: https://github.com/apache/pekko/issues/1910

   I have a cluster of 6 nodes using classic remoting, 4 of which are running 
on pekko. It's working fine, except that every now and then it seems messages 
are sent in the clear, e.g.:
   
   ```
   2025-06-18 19:00:34,953 WARN  [PTS-pekko.actor.default-dispatcher-17] 
o.a.p.r.t.netty.NettyTransport NettyTransport(pekko://PTS) - Remote connection 
to [/***:46890] failed with io.netty.handler.ssl.NotSslRecordException: not an 
SSL/TLS record: ...
   2025-06-18 19:00:34,958 WARN  [PTS-pekko.actor.default-dispatcher-28] 
o.a.p.r.t.netty.NettyTransport NettyTransport(pekko://PTS) - Remote connection 
to [***/***:1603] failed with javax.net.ssl.SSLException: Tag mismatch
   2025-06-18 19:00:34,958 WARN  [PTS-pekko.actor.default-dispatcher-28] 
o.a.p.r.t.netty.NettyTransport NettyTransport(pekko://PTS) - Remote connection 
to [***/***:1603] failed with io.netty.handler.ssl.NotSslRecordException: not 
an SSL/TLS record: ...
   2025-06-18 19:00:34,959 WARN  [PTS-pekko.actor.default-dispatcher-28] 
o.a.p.r.ReliableDeliverySupervisor 
akka.ssl.tcp://PTS@***:1603/system/endpointManager/reliableEndpointWriter-akka.ssl.tcp%3A%2F%2FPTS%40***%3A1603-7
 - Association with remote system [akka.ssl.tcp://PTS@***:1603] has failed, 
address is now gated for [5000] ms. Reason: [Disassociated]
   ```
   or
   ```
   2025-06-19 03:32:10,260 WARN  [PTS-pekko.actor.default-dispatcher-28] 
o.a.p.r.t.netty.NettyTransport NettyTransport(pekko://PTS) - Remote connection 
to [***/***:1600] failed with io.netty.handler.ssl.NotSslRecordException: not 
an SSL/TLS record: ...
   2025-06-19 03:32:10,260 WARN  [PTS-pekko.actor.default-dispatcher-28] 
o.a.p.r.ReliableDeliverySupervisor 
akka.ssl.tcp://PTS@***:1603/system/endpointManager/reliableEndpointWriter-akka.ssl.tcp%3A%2F%2FPTS%40***%3A1600-1
 - Association with remote system [akka.ssl.tcp://PTS@***:1600] has failed, 
address is now gated for [5000] ms. Reason: [Disassociated] 
   2025-06-19 03:32:22,285 WARN  [PTS-pekko.actor.default-dispatcher-5] 
o.a.p.r.PhiAccrualFailureDetector 
org.apache.pekko.remote.PhiAccrualFailureDetector@767aea20 - heartbeat interval 
is growing too large for address akka.ssl.tcp://PTS@***:1600: 15049 millis
   ```
   
   I can't share the record bytes b/c I'm not yet sure if they are control 
plane or data plane related—we use kryo, I'll try decode them. These messages 
only come from pekko nodes. Have you seen this before? I'll increase the log 
level to see if I can get more details.


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