Issue

We have a long-running web service which has a mod_cluster server in front of it. The problem we experience is that the destination web service gets called and it executes, but the calling client gets the following exception:

Caused by: java.io.IOException: Could not transmit message
        at org.jboss.ws.core.client.HTTPRemotingConnection.invoke(HTTPRemotingConnection.java:253)
        at org.jboss.ws.core.client.SOAPProtocolConnectionHTTP.invoke(SOAPProtocolConnectionHTTP.java:71)
        at org.jboss.ws.core.CommonClient.invoke(CommonClient.java:339)
        at org.jboss.ws.core.jaxws.client.ClientImpl.invoke(ClientImpl.java:231)
        ... 82 more
Caused by: org.jboss.remoting.CannotConnectException: Can not connect http client invoker after 1 attempt(s)
        at org.jboss.remoting.transport.http.HTTPClientInvoker.makeInvocation(HTTPClientInvoker.java:250)
        at org.jboss.remoting.transport.http.HTTPClientInvoker.transport(HTTPClientInvoker.java:162)
        at org.jboss.remoting.MicroRemoteClientInvoker.invoke(MicroRemoteClientInvoker.java:167)
        at org.jboss.remoting.Client.invoke(Client.java:1927)
        at org.jboss.remoting.Client.invoke(Client.java:770)
        at org.jboss.ws.core.client.HTTPRemotingConnection.invoke(HTTPRemotingConnection.java:232)
        ... 85 more
Caused by: org.jboss.ws.WSException: Invalid HTTP server response [503] - Service Temporarily Unavailable
        at org.jboss.ws.core.soap.SOAPMessageUnMarshallerHTTP.read(SOAPMessageUnMarshallerHTTP.java:75)
        at org.jboss.remoting.transport.http.HTTPClientInvoker.readResponse(HTTPClientInvoker.java:584)
        at org.jboss.remoting.transport.http.HTTPClientInvoker.useHttpURLConnection(HTTPClientInvoker.java:381)
        at org.jboss.remoting.transport.http.HTTPClientInvoker.makeInvocation(HTTPClientInvoker.java:232)
        ... 90 more

The mod_cluster error_log contains

[error] [client 10.228.182.63] proxy: error processing body
[error] proxy: dialog to 192.168.3.1:8009 (192.168.3.1) failed
[error] (70007)The timeout specified has expired: ajp_ilink_receive() can't receive header
[error] ajp_read_header: ajp_ilink_receive failed
[error] (120006)APR does not understand this error code: proxy: dialog to 192.168.0.2:8009 (192.168.0.2) failed
[error] proxy: CLUSTER: (balancer://mycluster). All workers are in error state