Hi: I have a com+ component installed using a application proxy on a remote computer. By the way, I have no problems when running the local client. I'm using a VB.NET Client. The problem occurs when I try to execute a method on the remote object: -------------------------------------------------------------- An unhandled exception of type 'System.InvalidCastException' occurred in Client.exe Additional information: QueryInterface for interface MyComponentLib.IMyInterface failed. -------------------------------------------------------------- Interestingly, The instantiation of the remote object by CreateObject succeeds and the application is activated on the server machine, i.e., I can see the rolling icon animation. Activating proxy in OLEVIEW also succeeds. The security is set to Interactive at this point. If I use a VB6 client I get 'Run-Time Error 424 Object Required' when I call CreateObject!! This is a very simple COM+ app but I'm really stuck! I'll appreciate any help... Thanks