WCF超时太快& &;'连接意外关闭'例外

当调用返回字符串"success"的方法时，WCF客户端在120秒后返回上述异常。来自服务器的日志显示它完全执行并在大约3分钟内完成。启用跟踪后，我看到没有抛出错误。任何帮助都将非常感激，因为来自类似问题的其他建议不幸没有帮助。谢谢!

编辑-解决:结果是客户端使用了Smoothwall过滤设备，该设备在两分钟后关闭连接。

System.ServiceModel.CommunicationException The underlying connection was closed: The connection was closed unexpectedly.
Stack Trace:    at System.Net.HttpWebRequest.GetResponse()
   at System.ServiceModel.Channels.HttpChannelFactory.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout)

InnerException:

System.Net.WebException The underlying connection was closed: The connection was closed unexpectedly.The underlying connection was closed: The connection was closed unexpectedly.
Stack Trace:    at System.Net.HttpWebRequest.GetResponse()
   at System.ServiceModel.Channels.HttpChannelFactory.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout)

据我所知，绑定设置正确，超时超过120秒。下面是客户端绑定:

<bindings>
  <customBinding>
      <binding name="CustomBinding_IPHG" closeTimeout="00:05:00"
          openTimeout="00:05:00" receiveTimeout="00:15:00" sendTimeout="00:15:00">
          <security authenticationMode="SecureConversation" requireDerivedKeys="false">
              <localClientSettings maxClockSkew="00:30:00" />
              <localServiceSettings maxClockSkew="00:30:00" />
              <secureConversationBootstrap authenticationMode="UserNameOverTransport">
                  <localClientSettings maxClockSkew="00:30:00" />
                  <localServiceSettings maxClockSkew="00:30:00" />
              </secureConversationBootstrap>
          </security>
          <textMessageEncoding>
              <readerQuotas maxStringContentLength="5242880" />
          </textMessageEncoding>
          <httpsTransport maxReceivedMessageSize="6553600" useDefaultWebProxy="true" />
      </binding>
  </customBinding>
</bindings>
<behaviors>
<endpointBehaviors>
<behavior name="commonBehaviour">
  <dataContractSerializer maxItemsInObjectGraph="2147483647"/>
  <clientCredentials>
    <serviceCertificate>
      <authentication certificateValidationMode="PeerOrChainTrust"/>
    </serviceCertificate>
  </clientCredentials>
</behavior>
</endpointBehaviors>
</behaviors>

服务器绑定:

<bindings>
  <customBinding>
    <binding name="CommonBinding" closeTimeout="00:05:00" openTimeout="00:05:00" receiveTimeout="00:15:00" sendTimeout="00:15:00">
      <transactionFlow />
      <security authenticationMode="SecureConversation" requireDerivedKeys="false">
        <secureConversationBootstrap authenticationMode="UserNameOverTransport">
          <localServiceSettings maxClockSkew="00:30:00" />
          <localClientSettings maxClockSkew="00:30:00" />
        </secureConversationBootstrap>
        <localServiceSettings maxClockSkew="00:30:00" />
        <localClientSettings maxClockSkew="00:30:00" />
      </security>
      <textMessageEncoding>
        <readerQuotas maxStringContentLength="41943040"/>
      </textMessageEncoding>
      <httpsTransport maxBufferSize="41943040" maxReceivedMessageSize="41943040" />
    </binding>
  </customBinding>
</bindings>
<behaviors>
  <serviceBehaviors>
    <behavior name="BehaviorRBS">
      <serviceMetadata httpsGetEnabled="true" httpGetEnabled="false" />
      <serviceDebug includeExceptionDetailInFaults="true" httpHelpPageEnabled="false" />
      <dataContractSerializer maxItemsInObjectGraph="2147483647" />
      <serviceCredentials>
        <userNameAuthentication userNamePasswordValidationMode="Custom" customUserNamePasswordValidatorType="PHGAPI.PHGUserNamePassValidator, PHGAPI"/>
        <serviceCertificate
                findValue="*.domainname.com"
                x509FindType="FindBySubjectName"
                storeLocation="LocalMachine"
                storeName="My" />
      </serviceCredentials>
      <serviceThrottling maxConcurrentCalls="200" maxConcurrentSessions="400" maxConcurrentInstances="600" />
    </behavior>
  </serviceBehaviors>
</behaviors>
<services>
    <service behaviorConfiguration="BehaviorRBS" name="PHGAPI.iAPI">
      <endpoint address="" binding="customBinding" bindingConfiguration="CommonBinding" contract="PHGAPI.IiAPI" />
    </service>
</services>

这是所讨论方法的接口:

[OperationContract]
string SetSuspensions(List<Suspension> suspensions);