 <p>Try escaping the .. with something like:</p> <pre><code>Uri target = new Uri("ftp://ftpserver.com/%2E%2E/AB00000/incoming/files"); </code></pre> <p>That works according to this <a href="http://blogs.msdn.com/mariya/default.aspx" rel="nofollow noreferrer">blog</a> which I found in this <a href="http://social.msdn.microsoft.com/Forums/en-US/netfxnetcom/thread/76d3a3a2-48b6-4753-988e-dfd845f582e9/" rel="nofollow noreferrer">discussion</a>.</p>