Using C# User Control as ActiveX control in IE6

Question

Hi, I had written a simple "Hello World" UserControl using C# and deploy it in IE6 as follow and it work fine if I place the CSApplet.dll & the html file in c:\inetpub\wwwroot\TestApplet (http://locallhost/TestApplet). But if I place it on other directory c:\inetpub\wwwtest\TestApplet (http://localhost:81/TestApplet) with the same security right for the both directory, the user control won't work. The only different between the 2 is that the first example uses port 80 while the second example uses port 81. Please help. Thank you. Regards, Justnice