The HTTP request is unauthorized with client authentication scheme 'Basic'. The authentication header received from the server was 'Negotiate,NTLM'


The HTTP request is unauthorized with client authentication scheme 'Basic'. The authentication header received from the server was 'Negotiate,NTLM'



I am trying to connect to a service using the following settings.


<bindings>
<basicHttpBinding>
<binding name="EngineSoap" closeTimeout="00:01:00" openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00" allowCookies="false" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard" maxBufferSize="2147483647" maxBufferPoolSize="524288" maxReceivedMessageSize="2147483647" messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered" useDefaultWebProxy="true">
<readerQuotas maxDepth="32" maxStringContentLength="2147483647" maxArrayLength="16384" maxBytesPerRead="4096" maxNameTableCharCount="16384"/>
<security mode="TransportCredentialOnly">
<transport clientCredentialType="Basic" proxyCredentialType="None" realm=""/>
<message clientCredentialType="UserName" algorithmSuite="Default"/>
</security>
</binding>
</basicHttpBinding>
</bindings>
<client>
<endpoint address="http://addressToService" binding="basicHttpBinding" bindingConfiguration="EngineSoap" contract="TRIMAPI.EngineSoap" name="EngineSoap" />
</client>



The error that I get is as follows:


The HTTP request is unauthorized with client authentication scheme 'Basic'. The authentication header received from the server was 'Negotiate,NTLM'. ---> System.Net.WebException: The remote server returned an error: (401) Unauthorized.
at System.Net.HttpWebRequest.GetResponse()
at System.ServiceModel.Channels.HttpChannelFactory.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout)
--- End of inner exception stack trace ---

Server stack trace:
at System.ServiceModel.Channels.HttpChannelUtilities.ValidateAuthentication(HttpWebRequest request, HttpWebResponse response, WebException responseException, HttpChannelFactory factory)
at System.ServiceModel.Channels.HttpChannelUtilities.ValidateRequestReplyResponse(HttpWebRequest request, HttpWebResponse response, HttpChannelFactory factory, WebException responseException, ChannelBinding channelBinding)
at System.ServiceModel.Channels.HttpChannelFactory.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout)
at System.ServiceModel.Channels.RequestChannel.Request(Message message, TimeSpan timeout)
at System.ServiceModel.Dispatcher.RequestChannelBinder.Request(Message message, TimeSpan timeout)
at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object ins, Object outs, TimeSpan timeout)
at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object ins, Object outs)
at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)



I tried to change clientCredentialType="Basic" to both "Windows" and "Ntlm" but in vain. I can't set the security mode to anything other than "TransportCredentialOnly" as the service doesn't use SSL.



Also, the username is something like 'domainusername'.



What am I missing?





Look at this thread it might help you
– Lukas Kubis
Oct 13 '14 at 7:16






@LukasKubis tried that but doesn't work
– nick-s
Oct 13 '14 at 22:06





@nick-s do you have any update on this?
– DanielV
Apr 4 '16 at 14:17





@DanielV did you try to check if the service host has 'basic authentication' enabled?
– nick-s
Apr 5 '16 at 13:40






@nick-s thanks for the update, but the issue was related to the network user, rather than the authentication method itself
– DanielV
Apr 5 '16 at 13:43




2 Answers
2



clientCredentialType needs to be Ntlm and not Basic


<bindings>
<basicHttpBinding>
<binding name="EngineSoap">
<security mode="TransportCredentialOnly">
<transport clientCredentialType="Ntlm" proxyCredentialType="None" realm=""/>
</security>
</binding>
</basicHttpBinding>
</bindings>



If it is an HTTPS/SSL connection then change TransportCredentialOnly to Transport.
See <transport> of <basicHttpBinding> for further information.


<transport> of <basicHttpBinding>



Basic authentication on the server (IIS) which hosted the service wasn't enabled. Enabling it fixed the issue for me.






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