# JNLP agent disconnection **URL:** \ **Category:** Ask a question\ **Tags:** question\ **Created:** [October 23, 2023, 5:08am UTC](https://community.jenkins.io/t/jnlp-agent-disconnection/10311 "2023-10-23T05:08:39Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![yaronkaikov](https://dub1.discourse-cdn.com/flex013/user_avatar/community.jenkins.io/yaronkaikov/32/5897_2.png) [@yaronkaikov](https://community.jenkins.io/u/yaronkaikov)\ **Post date:** [October 23, 2023, 5:08am UTC](https://community.jenkins.io/t/jnlp-agent-disconnection/10311/1 "2023-10-23T05:08:39Z")
Oct 23, 2023 7:15:23 AM hudson.remoting.jnlp.Main$CuiListener status INFO: Remote identity confirmed: 1f:c8:79:58:66:32:44:2f:09:0f:f6:27:58:cc:74:3d Oct 23, 2023 7:15:23 AM org.jenkinsci.remoting.protocol.impl.ConnectionHeadersFilterLayer onRecv INFO: [JNLP4-connect connection to [jenkins.scylladb.com/35.228.58.60:5899](http://jenkins.scylladb.com/35.228.58.60:5899)] Local headers refused by remote: sif is already connected to this controller. Rejecting this connection. Oct 23, 2023 7:15:23 AM hudson.remoting.jnlp.Main$CuiListener status INFO: Protocol JNLP4-connect encountered an unexpected exception java.util.concurrent.ExecutionException: org.jenkinsci.remoting.protocol.impl.ConnectionRefusalException: sif is already connected to this controller. Rejecting this connection. at org.jenkinsci.remoting.util.SettableFuture.get(SettableFuture.java:223) at hudson.remoting.Engine.innerRun(Engine.java:814) at hudson.remoting.Engine.run(Engine.java:543) Caused by: org.jenkinsci.remoting.protocol.impl.ConnectionRefusalException: sif is already connected to this controller. Rejecting this connection. at org.jenkinsci.remoting.protocol.impl.ConnectionHeadersFilterLayer.newAbortCause(ConnectionHeadersFilterLayer.java:380) at org.jenkinsci.remoting.protocol.impl.ConnectionHeadersFilterLayer.onRecvClosed(ConnectionHeadersFilterLayer.java:435) at org.jenkinsci.remoting.protocol.ProtocolStack$Ptr.onRecvClosed(ProtocolStack.java:825) at org.jenkinsci.remoting.protocol.FilterLayer.onRecvClosed(FilterLayer.java:289) at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.onRecvClosed(SSLEngineFilterLayer.java:168) at org.jenkinsci.remoting.protocol.ProtocolStack$Ptr.onRecvClosed(ProtocolStack.java:825) at org.jenkinsci.remoting.protocol.NetworkLayer.onRecvClosed(NetworkLayer.java:155) at org.jenkinsci.remoting.protocol.impl.BIONetworkLayer.access$1000(BIONetworkLayer.java:51) at org.jenkinsci.remoting.protocol.impl.BIONetworkLayer$Reader.run(BIONetworkLayer.java:274) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) at hudson.remoting.Engine$1.lambda$newThread$0(Engine.java:125) at java.base/java.lang.Thread.run(Thread.java:829) Suppressed: java.nio.channels.ClosedChannelException … 7 more ## Jenkins setup:Jenkins: 2.424 OS: Linux - 5.15.0-1027-gcp Java: 11.0.20.1 - Ubuntu (OpenJDK 64-Bit Server VM) Matrix-sorter-plugin:1.3 TestComplete:2.9.2 ace-editor:1.1 analysis-core:1.96 analysis-model-api:11.8.0 ansicolor:1.0.4 ant:497.v94e7d9fffa\_b\_9 antisamy-markup-formatter:162.v0e6ec0fcfcf6 any-buildstep:14.ve115ec1484f0 apache-httpcomponents-client-4-api:4.5.14-208.v438351942757 apache-httpcomponents-client-5-api:5.2.1-1.0 artifactdeployer:1.3 authentication-tokens:1.53.v1c90fd9191a\_b\_ aws-credentials:218.v1b\_e9466ec5da\_ aws-java-sdk:1.12.529-406.vdeff15e5817d aws-java-sdk-cloudformation:1.12.529-406.vdeff15e5817d aws-java-sdk-codebuild:1.12.529-406.vdeff15e5817d aws-java-sdk-ec2:1.12.529-406.vdeff15e5817d 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code-coverage-api:4.7.0 command-launcher:107.v773860566e2e commons-httpclient3-api:3.1-3 commons-lang3-api:3.13.0-62.v7d18e55f51e2 commons-text-api:1.10.0-78.v3e7b\_ea\_d5a\_fe1 compress-artifacts:98.vb\_20f3c77ddf7 compress-buildlog:1.2 conditional-buildstep:1.4.3 config-file-provider:959.vcff671a\_4518b\_ configuration-as-code:1700.v6f448841296e convert-to-pipeline:1.0 copy-project-link:106.veb\_028794a\_844 copy-to-agent:1.4.4 copyartifact:722.v0662a\_9b\_e22a\_c credentials:1271.v54b\_1c2c6388a\_ credentials-binding:636.v55f1275c7b\_27 dashboard-view:2.495.v07e81500c3f2 data-tables-api:1.13.6-4 display-url-api:2.3.9 distfork:1.8 docker-commons:439.va\_3cb\_0a\_6a\_fb\_29 docker-java-api:3.3.1-79.v20b\_53427e041 docker-plugin:1.5 docker-workflow:572.v950f58993843 dtkit-api:3.0.2 durable-task:523.va\_a\_22cf15d5e0 ec2:1628.v6d7b\_fc58b\_a\_1d ec2-fleet:3.0.0 echarts-api:5.4.0-6 email-ext:2.101 emailext-template:1.5 embeddable-build-status:412.v09da\_db\_1dee68 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jackson2-api:2.15.2-350.v0c2f3f8fc595 jakarta-activation-api:2.0.1-3 jakarta-mail-api:2.0.1-3 javadoc:243.vb\_b\_503b\_b\_45537 javax-activation-api:1.2.0-6 javax-mail-api:1.6.2-9 jaxb:2.3.8-1 jclouds-jenkins:2.31 jdk-tool:73.vddf737284550 jenkins-design-language:1.27.7 jenkins-multijob-plugin:623.v03401733c9a\_9 jersey2-api:2.40-1 jira:3.11 jjwt-api:0.11.5-77.v646c772fddb\_0 jnr-posix-api:3.1.17-1 job-restrictions:0.8 jobConfigHistory:1229.v3039470161a\_d jobcacher:399.v12d4fa\_dd3db\_d jquery:1.12.4-1 jquery-detached:1.2.1 jquery-ui:1.0.2 jquery3-api:3.7.1-1 jsch:0.2.8-65.v052c39de79b\_2 junit:1240.vf9529b\_881428 keep-agent-disconnected:1.0 ldap:694.vc02a\_69c9787f lockable-resources:1185.v0c528656ce04 log-parser:2.3.1 lucene-search:408.v0fb\_8d1093c83 mailer:463.vedf8358e006b\_ mapdb-api:1.0.9-28.vf251ce40855d matrix-auth:3.2.1 matrix-combinations-parameter:1.3.3 matrix-project:808.v5a\_b\_5f56d6966 matrixtieparent:1.2 maven-plugin:3.23 mercurial:1260.vdfb\_723cdcc81 metrics:4.2.18-442.v02e107157925 mina-sshd-api-common:2.10.0-69.v28e3e36d18eb\_ mina-sshd-api-core:2.10.0-69.v28e3e36d18eb\_ momentjs:1.1.1 multiple-scms:0.8 node-iterator-api:49.v58a\_8b\_35f8363 nodelabelparameter:1.12.0 oauth-credentials:0.645.ve666a\_c332668 okhttp-api:4.11.0-157.v6852a\_a\_fa\_ec11 pam-auth:1.10 parallel-test-executor:418.v24f9a\_141d726 parameter-separator:87.va\_1816d0b\_39d1 parameterized-scheduler:255.v73827fcdf618 parameterized-trigger:2.46 percentage-du-node-column:0.1.0 perfpublisher:8.09 pipeline-build-step:505.v5f0844d8d126 pipeline-github:2.8-155.8eab375ac9f8 pipeline-github-lib:42.v0739460cda\_c4 pipeline-graph-analysis:202.va\_d268e64deb\_3 pipeline-graph-view:198.v0844db\_6ca\_554 pipeline-groovy-lib:689.veec561a\_dee13 pipeline-input-step:477.v339683a\_8d55e pipeline-milestone-step:111.v449306f708b\_7 pipeline-model-api:2.2144.v077a\_d1928a\_40 pipeline-model-declarative-agent:1.1.1 pipeline-model-definition:2.2144.v077a\_d1928a\_40 pipeline-model-extensions:2.2144.v077a\_d1928a\_40 pipeline-multibranch-defaults:2.1 pipeline-rest-api:2.33 pipeline-stage-step:305.ve96d0205c1c6 pipeline-stage-tags-metadata:2.2144.v077a\_d1928a\_40 pipeline-stage-view:2.33 pipeline-utility-steps:2.16.0 plain-credentials:143.v1b\_df8b\_d3b\_e48 plugin-util-api:3.3.0 popper-api:1.16.1-3 popper2-api:2.11.6-2 postbuild-task:1.9 postbuildscript:3.2.0-550.v88192b\_d3e922 prism-api:1.29.0-8 promoted-builds:892.vd6219fc0a\_efb pubsub-light:1.17 rebuild:320.v5a\_0933a\_e7d61 resource-disposer:0.23 role-strategy:689.v731678c3e0eb\_ run-condition:1.7 s3:0.12.3445.vda\_704535b\_5a\_d saml:4.429.v9a\_781a\_61f1da\_ scm-api:676.v886669a\_199a\_a\_ scoring-load-balancer:59.vf791549fa\_989 script-security:1275.v23895f409fb\_d scriptler:321.v74a\_851a\_e7ed6 shared-objects:0.44 shelve-project-plugin:3.2 slack:684.v833089650554 agent-prerequisites:1.0 agent-setup:1.16 snakeyaml-api:2.2-111.vc6598e30cc65 sse-gateway:1.26 ssh-agent:333.v878b\_53c89511 ssh-credentials:308.ve4497b\_ccd8f4 ssh-slaves:2.916.vd17b\_43357ce4 sshd:3.312.v1c601b\_c83b\_0e structs:325.vcb\_307d2a\_2782 template-project:1.5.2 test-results-aggregator:2.0 test-results-analyzer:0.4.0 throttle-concurrents:2.14 timestamper:1.26 token-macro:384.vf35b\_f26814ec trilead-api:2.84.v72119de229b\_7 uno-choice:2.7.2 variant:60.v7290fc0eb\_b\_cd view-cloner:1.1 view-job-filters:369.ve0513a\_a\_f5524 warnings-ng:10.4.0 windows-azure-storage:386.v673495b0a5de windows-slaves:1.8.1 workflow-aggregator:596.v8c21c963d92d workflow-api:1281.vca\_5fddb\_3fceb\_ workflow-basic-steps:1042.ve7b\_140c4a\_e0c workflow-cps:3791.va\_c0338ea\_b\_59c workflow-cps-global-lib:609.vd95673f149b\_b workflow-durable-task-step:1289.v4d3e7b\_01546b\_ workflow-job:1346.v180a\_63f40267 workflow-multibranch:756.v891d88f2cd46 workflow-scm-step:415.v434365564324 workflow-step-api:639.v6eca\_cd8c04a\_a\_ workflow-support:865.v43e78cc44e0d ws-cleanup:0.45 xunit:3.1.3 ---
**Author:** ![jvonplutzner](https://dub1.discourse-cdn.com/flex013/user_avatar/community.jenkins.io/jvonplutzner/32/8278_2.png) [@jvonplutzner](https://community.jenkins.io/u/jvonplutzner)\ **Post date:** [May 17, 2024, 2:23pm UTC](https://community.jenkins.io/t/jnlp-agent-disconnection/10311/2 "2024-05-17T14:23:14Z")
Hi Yaron, My team is experiencing the same error on v2.401. There is no addition agent connection. There was, but I cleared out the double connection from a build agent websocket JNLP connection. We are recreated the Jenkins pod and still when I enable the build agent to connect to the Jenkins node configuration, it eventually crashes the Jenkins pod: ARNING org.eclipse.jetty.server.handler.ContextHandler$Context log Error while serving [https://xxxxxxxxxxxxxxxxxxx/net/wsagents/](https://xxxxxxxxxxxxxxxxxxx/net/wsagents/) java.lang.reflect.InvocationTargetException at org.kohsuke.stapler.Function$MethodFunction.invoke(Function.java:401) at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:409) at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:207) at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:140) at org.kohsuke.stapler.IndexDispatcher.dispatch(IndexDispatcher.java:28) at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:770) at org.kohsuke.stapler.Stapler.invoke(Stapler.java:900) at org.kohsuke.stapler.MetaClass$9.dispatch(MetaClass.java:475) at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:770) at org.kohsuke.stapler.Stapler.invoke(Stapler.java:900) at org.kohsuke.stapler.Stapler.invoke(Stapler.java:698) at org.kohsuke.stapler.Stapler.service(Stapler.java:248) at javax.servlet.http.HttpServlet.service(HttpServlet.java:590) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:764) at org.eclipse.jetty.servlet.ServletHandler$ChainEnd.doFilter(ServletHandler.java:1665) at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:157) at org.jenkinsci.plugins.ssegateway.Endpoint$SSEListenChannelFilter.doFilter(Endpoint.java:248) at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:154) at jenkins.telemetry.impl.UserLanguages$AcceptLanguageFilter.doFilter(UserLanguages.java:129) at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:154) at jenkins.security.ResourceDomainFilter.doFilter(ResourceDomainFilter.java:81) at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:154) at io.jenkins.blueocean.ResourceCacheControl.doFilter(ResourceCacheControl.java:134) at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:154) at io.jenkins.blueocean.auth.jwt.impl.JwtAuthenticationFilter.doFilter(JwtAuthenticationFilter.java:60) at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:154) at jenkins.metrics.impl.MetricsFilter.doFilter(MetricsFilter.java:125) at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:154) at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:160) at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202) at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635) at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:118) at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202) at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635) at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:94) at jenkins.security.AcegiSecurityExceptionFilter.doFilter(AcegiSecurityExceptionFilter.java:52) at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99) at hudson.security.UnwrapSecurityExceptionFilter.doFilter(UnwrapSecurityExceptionFilter.java:54) at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99) at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:126) at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:120) at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99) at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:100) at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99) at org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:145) at org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:101) at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99) at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:227) at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:221) at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99) at jenkins.security.BasicHeaderProcessor.doFilter(BasicHeaderProcessor.java:97) at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99) at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:117) at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87) at hudson.security.HttpSessionContextIntegrationFilter2.doFilter(HttpSessionContextIntegrationFilter2.java:63) at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99) at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:111) at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:172) at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202) at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635) at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:53) at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202) at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635) at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:86) at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202) at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635) at org.kohsuke.stapler.DiagnosticThreadNameFilter.doFilter(DiagnosticThreadNameFilter.java:30) at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202) at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635) at jenkins.security.SuspiciousRequestFilter.doFilter(SuspiciousRequestFilter.java:38) at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202) at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:527) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:131) at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:549) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:122) at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:223) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1570) at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:221) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1383) at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:176) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:484) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1543) at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:174) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1305) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:129) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:122) at org.eclipse.jetty.server.Server.handle(Server.java:563) at org.eclipse.jetty.server.HttpChannel.lambda$handle$0(HttpChannel.java:505) at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:762) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:497) at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:282) at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:314) at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:100) at org.eclipse.jetty.io.SelectableChannelEndPoint$1.run(SelectableChannelEndPoint.java:53) at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.runTask(AdaptiveExecutionStrategy.java:416) at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.consumeTask(AdaptiveExecutionStrategy.java:385) at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.tryProduce(AdaptiveExecutionStrategy.java:272) at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.lambda$new$0(AdaptiveExecutionStrategy.java:140) at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:411) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:934) at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1078) at java.base/java.lang.Thread.run(Thread.java:829) Caused by: org.jenkinsci.remoting.protocol.impl.ConnectionRefusalException: selenium-node is already connected to this controller. Rejecting this connection. at jenkins.slaves.DefaultJnlpSlaveReceiver.afterProperties(DefaultJnlpSlaveReceiver.java:143) at org.jenkinsci.remoting.engine.JnlpConnectionState.fire(JnlpConnectionState.java:337) at org.jenkinsci.remoting.engine.JnlpConnectionState.fireAfterProperties(JnlpConnectionState.java:386) at jenkins.agents.WebSocketAgents.doIndex(WebSocketAgents.java:106) at java.base/java.lang.invoke.MethodHandle.invokeWithArguments(MethodHandle.java:710) at org.kohsuke.stapler.Function$MethodFunction.invoke(Function.java:397) … 102 more Did you find a solution?