Jenkins+KubernetesでPodの起動に失敗する場合、「Inbound TCP Agent Protocol/4 (TLS encryption)」のチェックが外れているか確認する

エラー現象

以下のようにJenkinsジョブでPodの生成まで行われるが、
ジョブの実行にはいかず、延々とPod生成が繰り返し行われる。

Created Pod: default/sample-app-7z8w4-7gqpr
[Normal][default/sample-app-7z8w4-7gqpr][Scheduled] Successfully assigned default/sample-app-7z8w4-7gqpr to caltago
[Normal][default/sample-app-7z8w4-7gqpr][Pulling] Pulling image "sample/app"
[Normal][default/sample-app-7z8w4-7gqpr][Pulled] Successfully pulled image "sample/app"
[Normal][default/sample-app-7z8w4-7gqpr][Created] Created container scrapy
[Normal][default/sample-app-7z8w4-7gqpr][Started] Started container scrapy
[Normal][default/sample-app-7z8w4-7gqpr][Pulled] Container image "jenkins/jnlp-slave:4.0.1-1" already present on machine
[Normal][default/sample-app-7z8w4-7gqpr][Created] Created container jnlp
[Normal][default/sample-app-7z8w4-7gqpr][Started] Started container jnlp
Created Pod: default/sample-app-7z8w4-b0mzh
[Normal][default/sample-app-7z8w4-b0mzh][Scheduled] Successfully assigned default/sample-app-7z8w4-b0mzh to caltago
[Normal][default/sample-app-7z8w4-b0mzh][Pulling] Pulling image "sample/app"
[Normal][default/sample-app-7z8w4-b0mzh][Pulled] Successfully pulled image "sample/app"
[Normal][default/sample-app-7z8w4-b0mzh][Created] Created container scrapy
[Normal][default/sample-app-7z8w4-b0mzh][Started] Started container scrapy
[Normal][default/sample-app-7z8w4-b0mzh][Pulled] Container image "jenkins/jnlp-slave:4.0.1-1" already present on machine
[Normal][default/sample-app-7z8w4-b0mzh][Created] Created container jnlp
[Normal][default/sample-app-7z8w4-b0mzh][Started] Started container jnlp
Created Pod: default/sample-app-7z8w4-08cp2

原因

JenkinsSlave設定の「Inbound TCP Agent Protocol/4 (TLS encryption)」が未チェックになっていたため。
(どうもJenkinsのUpdateで引き継がれなかったっぽい?)

kubectl logs

INFO: Server reports protocol JNLP4-connect not supported, skipping
May 05, 2020 6:49:46 AM hudson.remoting.jnlp.Main$CuiListener error
SEVERE: The server rejected the connection: None of the protocols are enabled
java.lang.Exception: The server rejected the connection: None of the protocols are enabled
        at hudson.remoting.Engine.onConnectionRejected(Engine.java:825)
        at hudson.remoting.Engine.innerRun(Engine.java:767)
        at hudson.remoting.Engine.run(Engine.java:518)

エラー発生時の設定状態

エラー解決時の設定状態