WCF 연결 오류 - Expected record type 'PreambleAck'

결과부터 말씀드리면, WCF 서비스 측에서 http 포트로 8000번, net.tcp 포트를 8001번으로 열고 있었는데, WCF 클라이언트 측에서 net.tcp 접속을 8000번으로 시도하는 경우 이런 에러가 발생할 수 있습니다.

Server Error in '/' Application.

Expected record type 'PreambleAck', found '72'. 
  Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

 Exception Details: System.IO.InvalidDataException: Expected record type 'PreambleAck', found '72'.

Source Error: 


 An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.  

Stack Trace: 
[InvalidDataException: Expected record type 'PreambleAck', found '72'.]

[ProtocolException: You have tried to create a channel to a service that does not support .Net Framing. It is possible that you are encountering an HTTP endpoint.]
   System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg) +307
   System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type) +1291
   TestWcfLib.ITestWcf.HelloWorld(String connectionString) +0
   WebSiteTest.Test.Page_Load(Object sender, EventArgs e) in d:\...\Test.aspx.cs:98
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +25
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +52
   System.Web.UI.Control.OnLoad(EventArgs e) +117
   System.Web.UI.Control.LoadRecursive() +98
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2503