我们有一个连接到外部 Web 服务的 ASP.Net 网站,几天前它突然停止工作。
基本代码是这样的:
Try
request = New ExternalWebService.ProcessRequestService
' Error occurs here:
response = request.processCommand(parameters)
' Do some other stuff with response here
Catch webEx As System.Net.WebException
' This triggers and generic error gets displayed
Catch ex As Exception
Finally
End Try
The System.Net.WebException
被触发SendFailure
异常,并返回此堆栈跟踪:
The underlying connection was closed: An unexpected error occurred on a send. -
at System.Web.Services.Protocols.WebClientProtocol.GetWebResponse(WebRequest request)
at System.Web.Services.Protocols.HttpWebClientProtocol.GetWebResponse(WebRequest request)
at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters)
at ExternalWebService.ProcessRequestService.processCommand(parameters)
当我尝试在我的开发机器上调试这个问题时,它工作正常并且没有发生异常。
我们的网络服务器最近没有更新,我可以使用 FireFox 从网络服务器连接到 wsdl 服务(但是我无法与 IE 连接,但这可能与我们在网络服务器上使用 IE 时遇到的另一个问题有关)
我已尝试针对错误消息 #2 发布的所有解决方案here http://support.microsoft.com/kb/915599,包括设置KeepAlive = False
and ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3
,但是没有人努力解决这个问题。
我们的网络服务器运行 Windows Server 2003 和 IIS6.0
什么可能导致此错误在一台计算机上发生,而在另一台计算机上则不发生?
Edit:这是跟踪信息:
System.Web.Services.Asmx Information: 0 : Calling XmlSerializer [Create XmlSerializer]
Method: System.Xml.Serialization.XmlSerializer#1669721556::FromMappings(System.Xml.Serialization.XmlMapping[]#4002219=[4], ExternalWebService.ProcessRequestService#93032588=ExternalWebService.ProcessRequestService)
Caller: System.Web.Services.Protocols.SoapClientType#42808772::.ctor(ExternalWebService.ProcessRequestService#93032588=ExternalWebService.ProcessRequestService)
ProcessId=2796
LogicalOperationStack=
ThreadId=14
DateTime=2012-12-21T17:02:39.2826250Z
Timestamp=61755143048799345
System.Web.Services.Asmx Information: 0 : Return from XmlSerializer [Create XmlSerializer]
Caller: System.Web.Services.Protocols.SoapClientType#42808772::.ctor(ExternalWebService.ProcessRequestService#93032588=ExternalWebService.ProcessRequestService)
ProcessId=2796
LogicalOperationStack=
ThreadId=14
DateTime=2012-12-21T17:02:39.6576250Z
Timestamp=61755144323396760
System.Web.Services.Asmx Information: 0 : Calling XmlSerializer [Write Request]
Method: Microsoft.Xml.Serialization.GeneratedAssembly.ArrayOfObjectSerializer#1231684::Serialize(System.Xml.XmlTextWriter#8023888=.., System.Object[]#19695157=[40], (null), (null))
Caller: ExternalWebService.ProcessRequestService#60553900::Serialize()
ProcessId=2796
LogicalOperationStack=
ThreadId=14
DateTime=2012-12-21T17:02:39.7357500Z
Timestamp=61755144598320131
System.Web.Services.Asmx Information: 0 : Return from XmlSerializer [Write Request]
Caller: ExternalWebService.ProcessRequestService#60553900::Serialize()
ProcessId=2796
LogicalOperationStack=
ThreadId=14
DateTime=2012-12-21T17:02:39.7357500Z
Timestamp=61755144621621529
System.Web.Services.Asmx Information: 0 : Calling WebRequest.GetResponse
Method: System.Net.HttpWebRequest#2800407::GetResponse()
Caller: ExternalWebService.ProcessRequestService#60553900::GetWebResponse()
ProcessId=2796
LogicalOperationStack=
ThreadId=14
DateTime=2012-12-21T17:02:39.7357500Z
Timestamp=61755144622114240