Impersonation between 2 servers

[yudhiwl]

I am trying to move a document from one SharePoint farm to another but I believe this may be an asp.net issue.I am using the client object model for the target server and I keep getting issues with access denied when I don't manually set credentials.When I create new NetworkCredentials and give the client context those it works. The user I am trying to impersonate does have permission to add the item (I am using the same user in the NetworkCrendentials that I make)Is there something that needs to be done to allow impersonation between multiple server?