WCF - The remote server returned an unexpected response: (400) Bad Request.

The WCF fault "The remote server returned an unexpected response: (400) Bad Request.", might be caused by some quota or timeout on server / client side.The solution is to increase reader quota values from binding configuration on both sides:

<bindings>

<wsHttpBinding>

    <binding name="WSHttpBinding_IService" closeTimeout="00:01:00" 

    openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00"

    bypassProxyOnLocal="false" transactionFlow="false" hostNameComparisonMode="StrongWildcard"

    maxBufferPoolSize="2000000" maxReceivedMessageSize="2000000"

    messageEncoding="Text" textEncoding="utf-8" useDefaultWebProxy="true"

    allowCookies="false">

        <readerQuotas maxDepth="2000000" maxStringContentLength="2000000" maxArrayLength="2000000"

        maxBytesPerRead="2000000" maxNameTableCharCount="2000000" />

        <reliableSession ordered="true" inactivityTimeout="00:10:00" enabled="false" />

        <security mode="Message">

            <transport clientCredentialType="Windows" proxyCredentialType="None" realm="" />

            <message clientCredentialType="Windows" negotiateServiceCredential="true"

            algorithmSuite="Default" establishSecurityContext="true" />

        </security>

    </binding>

</wsHttpBinding>

</bindings>

<services>

    <service name="MyService" behaviorConfiguration="MyServiceTypeBehaviors">

        <endpoint address="" binding="wsHttpBinding" bindingConfiguration="WSHttpBinding_IService" contract="MyIService"/>

        <endpoint contract="IMetadataExchange" binding="mexHttpBinding" address="mex"/>

     </service>

</services>