Web services 多次调用web服务时出现问题

我有一个java客户端，它多次调用ApacheAxisWeb服务（部署在远程机器上的Oracle应用服务器上）

客户端将web服务调用分布在多个线程之间，一切都进行得很顺利，但在平均300次web服务调用（在所有线程中）之后，会从客户端引发ab异常：

java.net.SocketException: Unable to establish connection
at org.apache.axis.AxisFault.makeFault(AxisFault.java:101)
at org.apache.axis.transport.http.HTTPSender.invoke(HTTPSender.java:154)
at org.apache.axis.strategies.InvocationStrategy.visit(InvocationStrategy.java:32)
at org.apache.axis.SimpleChain.doVisiting(SimpleChain.java:11
at org.apache.axis.SimpleChain.invoke(SimpleChain.java:83)
at org.apache.axis.client.AxisClient.invoke(AxisClient.java:165)
at org.apache.axis.client.Call.invokeEngine(Call.java:2784)
at org.apache.axis.client.Call.invoke(Call.java:2767)
at org.apache.axis.client.Call.invoke(Call.java:2443)
at org.apache.axis.client.Call.invoke(Call.java:2366)
at org.apache.axis.client.Call.invoke(Call.java:1812)
at standardwebservice.StandardWebserviceSoapBindingStub.getStandardWebserviceData(StandardWebserviceSoapBindingStub.java:225)
at standardwebservice.StandardWebserviceProxy.getStandardWebserviceData(StandardWebserviceProxy.java:50)
at main.VericalThread.run(VericalThread.java:65)
Caused by: java.net.SocketException: Unable to establish connection
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(Unknown Source)
at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at sun.reflect.GeneratedMethodAccessor8.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.axis.components.net.DefaultSocketFactory.create(DefaultSocketFactory.java:153)
at org.apache.axis.components.net.DefaultSocketFactory.create(DefaultSocketFactory.java:120)
at org.apache.axis.transport.http.HTTPSender.getSocket(HTTPSender.java:191)
at org.apache.axis.transport.http.HTTPSender.writeToSocket(HTTPSender.java:404)
at org.apache.axis.transport.http.HTTPSender.invoke(HTTPSender.java:13
... 12 more
Thread No. 1 Start for calling 1210ZD106MAT2AAxisFault
faultCode: {http://schemas.xmlsoap.org/soap/envelope/}Server.userException
faultSubcode:
faultString: java.net.SocketException: Unable to establish connection
faultActor:
faultNode:
faultDetail:
{http://xml.apache.org/axis/}stackTrace:java.net.SocketException: Unable to establish connection
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(Unknown Source)
at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at sun.reflect.GeneratedMethodAccessor8.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.axis.components.net.DefaultSocketFactory.create(DefaultSocketFactory.java:153)
at org.apache.axis.components.net.DefaultSocketFactory.create(DefaultSocketFactory.java:120)
at org.apache.axis.transport.http.HTTPSender.getSocket(HTTPSender.java:191)
at org.apache.axis.transport.http.HTTPSender.writeToSocket(HTTPSender.java:404)
at org.apache.axis.transport.http.HTTPSender.invoke(HTTPSender.java:13
at org.apache.axis.strategies.InvocationStrategy.visit(InvocationStrategy.java:32)
at org.apache.axis.SimpleChain.doVisiting(SimpleChain.java:11
at org.apache.axis.SimpleChain.invoke(SimpleChain.java:83)
at org.apache.axis.client.AxisClient.invoke(AxisClient.java:165)
at org.apache.axis.client.Call.invokeEngine(Call.java:2784)
at org.apache.axis.client.Call.invoke(Call.java:2767)
at org.apache.axis.client.Call.invoke(Call.java:2443)
at org.apache.axis.client.Call.invoke(Call.java:2366)
at org.apache.axis.client.Call.invoke(Call.java:1812)
at standardwebservice.StandardWebserviceSoapBindingStub.getStandardWebserviceData(StandardWebserviceSoapBindingStub.java:225)
at standardwebservice.StandardWebserviceProxy.getStandardWebserviceData(StandardWebserviceProxy.java:50)
at main.VericalThread.run(VericalThread.java:65)

顺便说一句，当我在本地机器（在同一物理网络中）的oracle应用服务器上部署相同的web服务时，一切都进行得很顺利，并且没有出现此异常

顺便说一下，我还尝试了JAX-RPCWeb服务，并引发了相同的异常

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所以，有人能帮我一个忙吗。

服务器可能会在认为被淹没后将您关闭吗？它可能被配置为给您一个冷却期，因为它在短时间内从单个主机收到了太多的请求。感谢Erik的帮助，但我想指出的是，在抛出此异常后，客户端线程仍然可以继续成功地调用web服务，而不会出现异常，但是，在短时间的调用之后，同样的异常会再次从客户端的服务器抛出。