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Article - CS345258

Integration Runtime service fails to start with error "java.util.concurrent.TimeoutException: timeout waiting for websocket handshake to complete" in ThingWorx Navigate

Modified: 18-Nov-2025   


Applies To

  • Windchill Navigate (formerly ThingWorx Navigate) 9.0 to 9.7
  • ThingWorx Platform 9.0 to 9.7

Description

  • Error occurs during the initialization phase of the Integration Runtime service
  • ThingWorx Integration Runtime (IR) is not connected
  • Integration connectors show a failure to connect
  • IntegrationRuntime-XXXXX.log reports following error:
 INFO  c.t.i.Entrypoint - Integration Engine Deployed
[Client-EndpointMonitor-1] ERROR c.t.c.c.c.n.NettyClientConnectionFactory - Exception occurred while connecting to server
java.util.concurrent.TimeoutException: timeout waiting for websocket handshake to complete
    at com.thingworx.communications.client.connection.netty.NettyClientConnectionFactory$HandshakeCompletionNotifier.await(NettyClientConnectionFactory.java:693)
    at com.thingworx.communications.client.connection.netty.NettyClientConnectionFactory.createConnection(NettyClientConnectionFactory.java:398)
    at com.thingworx.communications.client.endpoints.ClientCommunicationEndpoint.refillConnections(ClientCommunicationEndpoint.java:230)
    at com.thingworx.communications.common.endpoints.monitor.ConnectivityMonitorTask.dutyCycleOn(ConnectivityMonitorTask.java:159)
    at com.thingworx.communications.common.endpoints.monitor.ConnectivityMonitorTask.run(ConnectivityMonitorTask.java:306)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
[NettyClient-NIO-1] ERROR c.t.c.c.c.n.ThingworxClientConnectionHandler - WebSocket exception caught!, closing connection!
javax.net.ssl.SSLException: SSLEngine closed already
    at io.netty.handler.ssl.SslHandler.wrap(SslHandler.java:829)
    at io.netty.handler.ssl.SslHandler.wrapAndFlush(SslHandler.java:792)
    at io.netty.handler.ssl.SslHandler.flush(SslHandler.java:773)
    at io.netty.handler.ssl.SslHandler.flush(SslHandler.java:1894)
    at io.netty.handler.ssl.SslHandler.closeOutboundAndChannel(SslHandler.java:1862)
    at io.netty.handler.ssl.SslHandler.close(SslHandler.java:724)
[Client-EndpointMonitor-700] ERROR c.t.c.c.c.n.NettyClientConnectionFactory - Exception occurred while connecting to server
java.util.concurrent.TimeoutException: timeout waiting for websocket handshake to complete
	at com.thingworx.communications.client.connection.netty.NettyClientConnectionFactory$HandshakeCompletionNotifier.await(NettyClientConnectionFactory.java:714)
	at com.thingworx.communications.client.connection.netty.NettyClientConnectionFactory.createConnection(NettyClientConnectionFactory.java:405)
	at com.thingworx.communications.client.endpoints.ClientCommunicationEndpoint.refillConnections(ClientCommunicationEndpoint.java:230)
	at com.thingworx.communications.common.endpoints.monitor.ConnectivityMonitorTask.dutyCycleOn(ConnectivityMonitorTask.java:159)
	at com.thingworx.communications.common.endpoints.monitor.ConnectivityMonitorTask.run(ConnectivityMonitorTask.java:318)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:829)
[Client-EndpointMonitor-700] INFO  c.t.c.c.c.n.NettyClientConnectionFactory - forcing underlying tcp channel closed [is open: true, is active: false]
[Client-EndpointMonitor-700] ERROR c.t.c.c.e.ClientCommunicationEndpoint - Refilling connections on [endpoint 6309, uri: <xxx://xxxx.com:8443/Thingworx/WS>] failed : timeout waiting for websocket handshake to complete
[Client-EndpointMonitor-700] ERROR c.t.c.c.e.ClientCommunicationEndpoint - Exception refilling connections was:
java.util.concurrent.TimeoutException: timeout waiting for websocket handshake to complete
	at com.thingworx.communications.client.connection.netty.NettyClientConnectionFactory$HandshakeCompletionNotifier.await(NettyClientConnectionFactory.java:714)
	at com.thingworx.communications.client.connection.netty.NettyClientConnectionFactory.createConnection(NettyClientConnectionFactory.java:405)
	at com.thingworx.communications.client.endpoints.ClientCommunicationEndpoint.refillConnections(ClientCommunicationEndpoint.java:230)
	at com.thingworx.communications.common.endpoints.monitor.ConnectivityMonitorTask.dutyCycleOn(ConnectivityMonitorTask.java:159)
	at com.thingworx.communications.common.endpoints.monitor.ConnectivityMonitorTask.run(ConnectivityMonitorTask.java:318)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:829)
 
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