WCF hosted in Azure throws System.Net.WebException when client tries to connect

▲
0
▼

I have a weird problem. Every few weeks, my WCF Web Servie hosted in Azure will throws System.Net.WebException: The remote server returned an error: (500) Internal Server Error.

Once that happen, I am no longer able to connect to the service. None of the connection will work until I am physically login to Azure portal and restart (stop/start) Azure Cloud Services.

Recently, I am able to replicate this problem in my local computer during debugging. At one instance, I was debugging a code and I left a debug break point too long (about 15 minutes). I get the following error (on client side) when I tried to connect:

System.ServiceModel.ProtocolException: The content type text/html; charset=utf-8 of the response message does not match the content type of the binding (application/soap+xml; charset=utf-8). If using a custom encoder, be sure that the IsContentTypeSupported method is implemented properly. The first 1024 bytes of the response were: '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>IIS 10.0 Detailed Error - 500.19 - Internal Server Error</title>
<style type="text/css">
<!--
body{margin:0;font-size:.7em;font-family:Verdana,Arial,Helvetica,sans-serif;}
code{margin:0;color:#006600;font-size:1.1em;font-weight:bold;}
.config_source code{font-size:.8em;color:#000000;}
pre{margin:0;font-size:1.4em;word-wrap:break-word;}
ul,ol{margin:10px 0 10px 5px;}
ul.first,ol.first{margin-top:5px;}
fieldset{padding:0 15px 10px 15px;word-break:break-all;}
.summary-container fieldset{padding-bottom:5px;margin-top:4px;}
legend.no-expand-all{padding:2px 15px 4px 10px;margin:0 0 0 -12px;}
legend{color:#333333;;margin:4px 0 8px -12px;_margin-top:0px;
font-weight:bold;font-size:1em;}
a:link,a:visited{color:#007EFF;font-weight:bold;}
a:hover{text-decoration:none;}
h1{font-size:2.4em;margin:0;color:#FFF;}
h2{font-size:1.7em;margin:'. ---> System.Net.WebException: The remote server returned an error: (500) Internal Server Error.
   at System.Net.HttpWebRequest.GetResponse()
   at System.ServiceModel.Channels.HttpChannelFactory`1.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout)
   --- End of inner exception stack trace ---

Server stack trace:
   at System.ServiceModel.Channels.HttpChannelUtilities.ValidateRequestReplyResponse(HttpWebRequest request, HttpWebResponse response, HttpChannelFactory`1 factory, WebException responseException, ChannelBinding channelBinding)
   at System.ServiceModel.Channels.HttpChannelFactory`1.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout)
   at System.ServiceModel.Channels.RequestChannel.Request(Message message, TimeSpan timeout)
   at System.ServiceModel.Channels.SecurityChannelFactory`1.SecurityRequestChannel.Request(Message message, TimeSpan timeout)
   at System.ServiceModel.Security.SecuritySessionSecurityTokenProvider.DoOperation(SecuritySessionOperation operation, EndpointAddress target, Uri via, SecurityToken currentToken, TimeSpan timeout)
   at System.ServiceModel.Security.SecuritySessionSecurityTokenProvider.GetTokenCore(TimeSpan timeout)
   at System.IdentityModel.Selectors.SecurityTokenProvider.GetToken(TimeSpan timeout)
   at System.ServiceModel.Security.SecuritySessionClientSettings`1.ClientSecuritySessionChannel.OnOpen(TimeSpan timeout)
   at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannel.OnOpen(TimeSpan timeout)
   at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)

Exception rethrown at [0]:
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
   at System.ServiceModel.ICommunicationObject.Open(TimeSpan timeout)
   at System.ServiceModel.ClientBase`1.System.ServiceModel.ICommunicationObject.Open(TimeSpan timeout)
   at System.ServiceModel.ClientBase`1.Open()
   at WMShared.WMWeb.Login(String username, String password) in C:\PRO\WarehouseManagement\Libraries\WMShared\WMAPIWeb.cs:line 54
   at WMShared.WMWeb.WebReq.Login(String username, String password, XRestServiceClient& xrsClient) in C:\PRO\WarehouseManagement\Libraries\WMShared\Services\WebReq\WebReq.cs:line 100

It looks like the WCF server is unable to recover?

In the server, I also get an exception when I tried to start a background worker using Task.Factory.StartNew():

System.Threading.Tasks.TaskSchedulerException: 'An exception was thrown by a TaskScheduler.'

Inner Exception
AppDomainUnloadedException: Attempted to access an unloaded AppDomain.

When I tried to view the service using https://localhost:44300/WarehouseManagementService.svc I get this error:

Detailed Error Information:
    Module     CustomErrorModule
    Notification       SendResponse
    Handler    Not yet determined
    Error Code     0x80070490
    Config Error       The configuration section 'system.webServer/httpErrors' cannot be read because it is missing a section declaration
    Config File    \\?\C:\Users\shopkins\AppData\Local\dftmp\Resources\aa0cf43d-1904-4c6d-a283-0c6c75c83825\temp\temp\RoleTemp\applicationHost.config

I am keep getting those error until I physically restart the service.

Any idea how to recover or restart WCF service again?

Cheers, Sam

c#
azure
wcf
azure-cloud-services
asked on Stack Overflow Feb 17, 2018 by Sam

0 Answers

Nobody has answered this question yet.

User contributions licensed under CC BY-SA 3.0