Swarm client 3.27.

After loosing connection (I don't know the reason), the swarm client shall reconnect to the "Jenkins" server, but it says in the log, that connection is already established.

I expect that the swarm client reconnect to the "Jenkins" server without error,
or having the following situation, clears up old connection, and creates a new, fresh one.

Please for correcting, or for advice, what is going wrong, maybe client swarm is ok.

I attach also some full error logs.

The issue is repeatable and always the same, as in the following example log:

Jul 07, 2021 10:57:41 PM hudson.remoting.jnlp.Main$CuiListener status
INFO: Terminated
(...)
.
.
.
(...)
Jul 07, 2021 10:57:41 PM hudson.plugins.swarm.Client run
WARNING: Remaining retries: 299
Jul 07, 2021 10:57:41 PM hudson.plugins.swarm.Client run
INFO: Retrying in 60 seconds
Jul 07, 2021 10:58:41 PM hudson.plugins.swarm.Client run
INFO: Attempting to connect to https://jenkins-regression-nft.kce.devops.rockwell.com/
(...)
.
.
.
(...)
INFO: Handshaking
Jul 07, 2021 10:58:46 PM hudson.remoting.jnlp.Main$CuiListener status

INFO: Connecting to jenkins-regression-nft.kce.devops.rockwell.com:32035
Jul 07, 2021 10:58:46 PM hudson.remoting.jnlp.Main$CuiListener status
INFO: Trying protocol: JNLP4-connect
Jul 07, 2021 10:58:46 PM hudson.remoting.jnlp.Main$CuiListener status
INFO: Remote identity confirmed: 52:4d:78:17:3a:9b:22:e8:eb:33:75:df:a6:71:37:45
Jul 07, 2021 10:58:46 PM org.jenkinsci.remoting.protocol.impl.ConnectionHeadersFilterLayer onRecv
INFO: [JNLP4-connect connection to jenkins-regression-nft.kce.devops.rockwell.com/10.76.72.130:32035] Local headers refused by remote: tbenzt-1 is already connected to this master. Rejecting this connection.
Jul 07, 2021 10:58:46 PM hudson.remoting.jnlp.Main$CuiListener status
INFO: Protocol JNLP4-connect encountered an unexpected exception
java.util.concurrent.ExecutionException: org.jenkinsci.remoting.protocol.impl.ConnectionRefusalException: tbenzt-1 is already connected to this master. Rejecting this connection.

Related issues:

https://issues.jenkins.io/browse/JENKINS-5055

https://issues.jenkins.io/browse/JENKINS-5973

Best regards

Grzegoz Guzik

"NoYes" Team

Rockwell Automation